I got this problem with Sphax PureBD Craft 64x Texture Pack for Attack of The B-Team.
Every time I try to pick the Texture Pack i get a crash.
If somenone can write the "System Requirements" for the Texture Pack for this Modpack it would be very ussefull.
My PC data: Intel i3 dual core 3.6 GHz
4 GB RAM DDR3
AMD 5760 HD Graphics Card