The same thing is happening with me. With the original folder the launcher was placed I can open the launcher. When I go to log in the launcher window remains open and nothing happens. Here is the launcher console data:
Code:
loading modpack information...
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/modpacks.xml
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/logo_ftb.png
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/FTBBetaA.zip
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/splash_FTB.png
adding pack 0
Logging in...
Login complete.
Loading jars...
Loading URL: file:/C:/Users/Kardashev/Minecraft/FTBBETAA/.minecraft/bin/minecraftforge.zip
Loading URL: file:/C:/Users/Kardashev/Minecraft/FTBBETAA/.minecraft/bin/minecraft.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft/FTBBETAA/.minecraft/bin/lwjgl.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft/FTBBETAA/.minecraft/bin/lwjgl_util.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft/FTBBETAA/.minecraft/bin/jinput.jar
Loading natives...
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.ftb.gui.LaunchFrame.launchMinecraft(LaunchFrame.java:837)
at net.ftb.gui.LaunchFrame.runGameUpdater(LaunchFrame.java:715)
at net.ftb.gui.LaunchFrame$8.done(LaunchFrame.java:645)
at javax.swing.SwingWorker$5.run(Unknown Source)
at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source)
at sun.swing.AccumulativeRunnable.run(Unknown Source)
at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source)
at javax.swing.Timer.fireActionPerformed(Unknown Source)
at javax.swing.Timer$DoPostEvent.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
When placing the launcher in a new folder and starting that up, the launcher opens fine and launches minecraft fine. Minecraft in this instance opens in vanilla with no mods. When first launching the launcher downloads mod pack info with a size of 29313kb. None of the mods are placed in the .minecraft/mods folder which actually does not exist. When looking in the temp/FTBBETAA folder in the FTBBetaA zip file all of the mods, configs, etc. are in there. Here is the code shown for this instance:
loading modpack information...
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/modpacks.xml
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/logo_ftb.png
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/FTBBetaA.zip
http://repo.creeperhost.net/direct/FTB2/bedb3648282cd79042acc30bd30a8a70/splash_FTB.png
java.io.FileNotFoundException: C:\Users\Kardashev\Minecraft Test\logindata (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileReader.<init>(Unknown Source)
at net.ftb.data.UserManager.read(UserManager.java:93)
at net.ftb.gui.LaunchFrame.<init>(LaunchFrame.java:265)
at net.ftb.gui.LaunchFrame$1.run(LaunchFrame.java:223)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Error loading login data
adding pack 0
Logging in...
Login complete.
Loading Jar URLs
Downloading Jars
Connecting.. Try 1 of 5
Connecting.. Try 1 of 5
Connecting.. Try 1 of 5
Connecting.. Try 1 of 5
Connecting.. Try 1 of 5
Extracting Files
Game update complete.
FTBBETAA
Downloading
Entracting
IOError :java.io.FileNotFoundException: C:\Users\Kardashev\Minecraft Test\temp\FTBBETAA\.minecraft (Access is denied)
Installing
dirs mk'd
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\jinput.jar to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\jinput.jar
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\lwjgl.jar to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\lwjgl.jar
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\lwjgl_util.jar to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\lwjgl_util.jar
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\md5s to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\md5s
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\minecraft.jar to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\minecraft.jar
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\jinput-dx8.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\jinput-dx8.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\jinput-dx8_64.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\jinput-dx8_64.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\jinput-raw.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\jinput-raw.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\jinput-raw_64.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\jinput-raw_64.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\lwjgl.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\lwjgl.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\lwjgl64.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\lwjgl64.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\OpenAL32.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\OpenAL32.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\natives\OpenAL64.dll to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\natives\OpenAL64.dll
File copied from C:\Users\Kardashev\Minecraft Test\.minecraft\bin\version to C:\Users\Kardashev\Minecraft Test\FTBBETAA\.minecraft\bin\version
Renamed minecraft.jar to mcbackup.jar
Loading jars...
Loading URL: file:/C:/Users/Kardashev/Minecraft%20Test/FTBBETAA/.minecraft/bin/minecraftforge.zip
Loading URL: file:/C:/Users/Kardashev/Minecraft%20Test/FTBBETAA/.minecraft/bin/minecraft.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft%20Test/FTBBETAA/.minecraft/bin/lwjgl.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft%20Test/FTBBETAA/.minecraft/bin/lwjgl_util.jar
Loading URL: file:/C:/Users/Kardashev/Minecraft%20Test/FTBBETAA/.minecraft/bin/jinput.jar
Loading natives...
Fixed Minecraft Path: Field was private static java.io.File net.minecraft.client.Minecraft.an
MCDIR: C:\Users\Kardashev\AppData\Roaming\.minecraft
27 achievements
208 recipes
Setting user: kardashev, -8468433226904403268
Client asked for parameter: server
LWJGL Version: 2.4.2
Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see
http://www.lwjgl.org)
OpenAL initialized.
Hopefully this helps will keep trying other ideas. If you need further information let me know. Running Windows 7 64bit with 32bit Java.