Cannot run magic farm from vanilla launcher

[keybounce]

(Originally posted on minecraft forums in modded client support, Jan 25th. No response there, so reposting here).
I am unable to use the vanilla launcher to run Magic Farm.
This worked just fine previously, and is broken now.
The crashing line is

[20:39:55 INFO]: Client> Error: Could not find or load main class

The modpack in question is (FTB) Magic Farm 2.
It worked fine for a while at modpack version 1.1.4.
Today, I updated the modpack to version 1.1.7 -- I had to update the FTB launcher from version 1.2.6 up to 1.3.4 in order to update the modpack (older launcher would not see the new update).
I played a fair amount last night, with the vanilla launcher and this modpack.
Tonight, attempting that same thing, results in an error.

Spoiler

[20:39:36 INFO]: Minecraft Launcher 1.3.9 (through bootstrap 5) started on osx...
[20:39:36 INFO]: Refreshing local version list...
[20:39:36 INFO]: Current time is Jan 25, 2014 8:39:36 PM
[20:39:36 INFO]: System.getProperty('os.name') == 'Mac OS X'
[20:39:36 INFO]: System.getProperty('os.version') == '10.7.5'
[20:39:36 INFO]: System.getProperty('os.arch') == 'x86_64'
[20:39:36 INFO]: System.getProperty('java.version') == '1.7.0_45'
[20:39:36 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[20:39:36 INFO]: System.getProperty('sun.arch.data.model') == '64'
[20:39:36 INFO]: Refreshing remote version list...
[20:39:36 INFO]: Refresh complete.
[20:39:37 INFO]: Loaded 12 profile(s); selected 'FtB Magic Farm'
[20:39:37 INFO]: Refreshing auth...
[20:39:37 INFO]: Logging in with access token
[20:39:54 INFO]: Getting syncinfo for selected version
[20:39:54 INFO]: Queueing library & version downloads
[20:39:54 INFO]: Download job 'Version & Libraries' started (16 threads, 22 files)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-osx.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/ow2/asm/asm-all/4.1/asm-all-4.1.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/net/minecraft/launchwrapper/1.8/launchwrapper-1.8.jar for job 'Version & Libraries'... (try 0)
[20:39:54 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Download job 'Resources' skipped as there are no files to download
[20:39:55 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.0/lwjgl-platform-2.9.0-natives-osx.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Attempting to download /Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965.jar for job 'Version & Libraries'... (try 0)
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/net/minecraft/launchwrapper/1.8/launchwrapper-1.8.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/ow2/asm/asm-all/4.1/asm-all-4.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-osx.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.0/lwjgl-platform-2.9.0-natives-osx.jar for job 'Version & Libraries': Local file matches local checksum, using that
[20:39:55 INFO]: Finished downloading /Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965.jar for job 'Version & Libraries': Couldn't connect to server (responded with 403) but have local file, assuming it's good
[20:39:55 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:00.982)
[20:39:55 INFO]: Launching game
[20:39:55 INFO]: Looking for old natives & assets to clean up...
[20:39:55 INFO]: Unpacking natives to /Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965-natives-1390711195543477000
[20:39:55 INFO]: Reconstructing virtual assets folder at /Users/michael/Library/Application Support/minecraft/assets/virtual/legacy
[20:39:55 INFO]: Launching in /Users/michael/Documents/Games/Minecraft/Playing/FtB/MagicFarm2/minecraft
[20:39:55 INFO]: Half command: /usr/bin/java -Xdock:icon=/Users/michael/Library/Application Support/minecraft/assets/objects/99/991b421dfd401f115241601b2b373140a8d78572 -Xdock:name=Minecraft -XX:+UseConcMarkSweepGC -XX:-CMSPrecleaningEnabled -XX:MaxHeapFreeRatio=25 -XX:MinHeapFreeRatio=21 -XX:CMSInitiatingOccupancyFraction=82 -XX:SurvivorRatio=4 -XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses -XXarallelCMSThreads=2 -XXarallelGCThreads=2 -XX:MaxPermSize=150m -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+PrintTenuringDistribution -XX:+PrintCommandLineFlags -XX:+PrintHeapAtGC -XX:+PrintGCDetails -Xloggc:GC.log -XX:+PrintGCDateStamps -Djava.library.path=/Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965-natives-1390711195543477000 -cp /Users/michael/Library/Application Support/minecraft/libraries/net/minecraftforge/minecraftforge/9.11.1.965/minecraftforge-9.11.1.965.jar:/Users/michael/Library/Application Support/minecraft/libraries/net/minecraft/launchwrapper/1.8/launchwrapper-1.8.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/ow2/asm/asm-all/4.1/asm-all-4.1.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/scala-lang/scala-library/2.10.2/scala-library-2.10.2.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/scala-lang/scala-compiler/2.10.2/scala-compiler-2.10.2.jar:/Users/michael/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar:/Users/michael/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar:/Users/michael/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar:/Users/michael/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/michael/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar:/Users/michael/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar:/Users/michael/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar:/Users/michael/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar:/Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965.jar net.minecraft.launchwrapper.Launch
[20:39:55 INFO]: Client> Error: Could not find or load main class
[20:39:55 ERROR]: Game ended with bad state (exit code 1)
[20:39:55 INFO]: Deleting /Users/michael/Library/Application Support/minecraft/versions/1.6.4-Forge9.11.1.965/1.6.4-Forge9.11.1.965-natives-1390711195543477000
[20:39:55 INFO]: Ignoring visibility rule and showing launcher due to a game crash

Client logs:
Last night, successful launch from vanilla: https://gist.github....ybounce/8628568
Tonight, successful launch from FTB launcher: https://gist.github....ybounce/8628594
Again: I can run this from the FTB launcher.
Last night, I could use the vanilla launcher.
Tonight, I cannot.
The classpath and library paths are similar, but not identical, between the two launches.
Additional notes: While the 965 magic farm installation fails to even start up, my 953 forge installation does start up: (This is bare, no mods other than FML/Forge)
https://gist.github.com/keybounce/8715995

 

[Wagon153]

If theres an update to Forge, try updating it.

 

[keybounce]

No, no update to forge.

 

[Wagon153]

Why are you trying it from the vanilla launcher by the way? Just curious.

 

[keybounce]

A couple of reasons, off the top of my head:
1. Vanilla launcher's field for extra java arguments is much bigger, and usable; FTB launcher's window is too small.
2. Vanilla does not force options on me that I cannot alter; FTB does.

 

[keybounce]

3. ** Just became critical:

I cannot set up two slightly different instances of a single modpack in FTB launcher. If, for example, I have a solo world that is pure Magic Farm, and a server that is magic farm plus morph plus sync, I cannot have two different instances set up for the two different targets.

 

[Tristam Izumi]

3. ** Just became critical:

I cannot set up two slightly different instances of a single modpack in FTB launcher. If, for example, I have a solo world that is pure Magic Farm, and a server that is magic farm plus morph plus sync, I cannot have two different instances set up for the two different targets.

This is a known "issue" and I believe the functionality you're asking for will be incorporated into the new launcher. In the mean time, I suggest using MultiMC 5 to manage multiple versions of modpacks.