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That's caused by running the 32 bit version of java. But the logs claim that you'r running 32 bit version of windows 8 as well. Though, i've seen the logs be rather creative about what OS they claim to be made on. If you have 64 bit windows then that problem can be fixed by uninstalling 32 bit...

What's your fps in vanilla minecraft? Are you playing on a laptop?

It's a bug that causes a mob to spawn in the exact same location every tick. The only fix i know of is to force the chunk it's in to reset. Eigther with MCedit, deleting it manualy or using some kind of MC tool.

Does FTB produce a log of any kind?

And you'r running java 1.6, not java 1.7?

Try adding the java paremeter -XX:MaxPermSize=256m. Not really sure how to add it in multiMC. Also, make sure you'r running java 1.6 and not 1.7.

Does done everything include this?

Uninstall java 32 bit, install java 64 bit. Can't promise that more ram will help.

Dissabling anti virus / firewall or adding the FTB folder to the safelist of said anti virus/ firewall seems to have solved simulare issues for others.

Updating LWJGL would be a good start. If that doesn't work then dissabling the voxel mods could be worth a try, especialy the map one. If that doesn't help, then updating your java wouldn't hurt i guess. And if none of those work then more information would be nice.

This could possibly be caused by the non english letter in your windows username. If redownloading doesn't work then it could be worth a shot to make a 2. windows user with no special letters and try to install it there just to rule out that posibility.

I believe this fix might help.

When you start the launcher there is a tab called "options", when you click on that you'll get a bar on the bottom of the launcher that says "advanced options". When you click on that a window will open, and in that window there will be a field called "Additional java parameters". Copy...

I'll just take a stab in the dark. The mac wonderfix seems to help alot of people And updating your graphics drivers couldn't hurt. Both of them long shots though probably won't help i guess.

I'm clueless, but the maxpermsize fix seems to help a lot of people on mac, so it wouldn't hurt to try it. The symptoms seem to kinda fit.

If that doesn't work then updating LWJGL could also be worth a shot.

Try disabling the voxel mods, if that doesn't work, try disabling the secret rooms mod.

I guess we'll just attack the problem from a different angle then. You could try to run FTB trough multiMC, that should hopefully remove the problems. Here is a guide for importing FTB mods to multiMC.

My best guess is that your graphic card isn't getting kicked out of power save mode even though it's needed. None of the computers i have access to have dedicated graphics solutions from intel though, so i'm not sure how to fix this if that is the issue. But you should have a program called...