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No clue on the first one. Second one is easy. Change -XX:PermSize=128M to -XX:PermSize=256M

If you were on 1.6.4, I'd recommend Opis to track down tickrate lag, but I don't believe there's a 1.5.2 version of it.

Damn. What happens when you open up the world in MCEdit?

And you're using your Mojang account email and password?

Install Java 1.7.0_51 x64 from here: http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html Change the RAM in the FTB launcher to 2 GB. Play Minecraft.

I'm honestly surprised you were able to get away with not using Java 7 in the first place. Over half the tickets here are solved by people updating Java or adding exclusions to their antivirus.

Add your FTB install folder to the exclusions list on your antivirus. If you don't know how to do this, Google "add exception to <antivirus name>".

How long did you wait?

Update to Java 7. http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html

Back up your world before doing anything else. It may be mostly broken, but that's better than gone. Go into your world's save folder, and rename level.dat to level.old (or whatever you want). Then copy your level.dat_old, and rename the copy level.dat. See if that lets you recover your world...

Kill taintacles. And be careful, the stuff degrades so make it quick.

Knowing the derpiness of those graves, it could be on some other random y-level, so in some other random cave nearby. Also, weren't the gravestones turned off in most of the FTB packs a while ago due to said derpiness (as well as occasionally never appearing)?

You forget that we're all just volunteers that are helping out Ashzification (who is herself a volunteer). Some times these things stump us.

How much RAM does your system have? Because assigning 12 GB of RAM to Minecraft is almost never a good idea. Not saying this will fix it, but try lowering that to 2-3 GB.

Will you post your console log to pastebin.com?

Try not saving the password in the profile in the FTB launcher. You'll have to manually put in the password each time, but that seems to work for many people with your problem.

Uninstall all versions of Java. Restart. Install Java 1.7.0_51 x64 from here: http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html Set RAM to 2 GB in the Options on the launcher. Play Minecraft.

You have a 64-bit OS, but you're using 32-bit Java. Install Java 1.7.0_51 x64 from here: http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html Then be sure to set the launcher to be using 2 GB of RAM (under Options).

Make sure "Reopen launcher" and "Show console" are checked under the Options on the FTB launcher. Try to open the pack; when it reopen the launcher, go to the console and click "post my log to pastebin.com" and post the link it provides to this thread.

Can you post your console log to pastebin.com and link it here?