Keyarose: This is an issue with NotEnoughIDs, I need to investigate this closer and add a fix to FC or NEIDs.
Alaberti: The log (fml-client-latest.txt) has more info/context I need to see what's going on, please post it as well.
Here is the log, as requested. It looks like warp drive is the offender here. https://gist.github.com/Alaberti/7776f478002d1d53e8f2
Edit: Removing the mod seems to address the crash, though the error now references the same com.gildedgames.util.threadedlighting.world.ThreadedWorld.run issue you addressed earlier. I believe the code is from Aether II or its core mod, gilded-utils. The error is now a triggering exception: https://gist.github.com/Alaberti/19b1d10171abd2c580a5 however it does not appear to crash the game out any longer.
Edit 2: Removing the Aether II mod and its coremod has stopped the crashing. Warpdrive has not created any problems since.