I've heard 3 complaints about this in the last few days. Just an FYI.Just a note, as I write this, I can't launch the mod pack anymore. Here's my crash report: http://textuploader.com/d1ovk
Couldn't launch the game, if anybody have a solution please help thanks!
EDIT: OK Looks like I might found out the problem. It was probably my new update for NVIDIA I installed tonight. Never thought that it could be an issue. Version is 378.49 Don't install this to play minecraft.