ok i've fixed the problem by typing in the java code:
-Xms256m -XX:PermSize=128M -XX:MaxPermSize=256m
just type that in the additional java parameters option in ,,advanced options''
then it should work,but when i start ftb ultimate(without problems) and i start a new world it just freezes at
Loading World
Building Terrain...
in the console there pops up a red line which says:
2013-11-19 16:57:59 [Schwerwiegend] [ForgeModLoader] The ForgeModLoader state engine has become corrupted. Probably, a state was missed by and invalid modification to a base classForgeModLoader depends on. This is a critical error and not recoverable. Investigate any modifications to base classes outside ofForgeModLoader, especially Optifine, to see if there are fixes available.
2013-11-19 16:57:59 [Information] [STDERR] Exception in thread "Server thread" java.lang.RuntimeException: The ForgeModLoader state engine is invalid
2013-11-19 16:57:59 [Information] [STDERR] at cpw.mods.fml.common.LoadController.transition(LoadController.java:122)
2013-11-19 16:57:59 [Information] [STDERR] at cpw.mods.fml.common.Loader.serverStopped(Loader.java:780)
2013-11-19 16:57:59 [Information] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.handleServerStopped(FMLCommonHandler.java:469)
2013-11-19 16:57:59 [Information] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:559)
2013-11-19 16:57:59 [Information] [STDERR] at fy.run(SourceFile:849)
Unhandled exception in Thread[AWT-EventQueue-0,6,main]: java.lang.IndexOutOfBoundsException: Index: 4, Size: 4
btw i dont have optifine or other mods added
i hope somebody can help me 