I really would love to play tekkit/yogbox/voltz/ect, but It doesn't work! What happens is I open my launcher, log In and launch one of the mod packs. If i already downloaded it, FML pops up claiming it's "fixing something", and then i get a window with the name of the mod pack I'm using, but it is blank. after 3 or 4 seconds it closes itself, and I don't even get a "the application shut down unexpectedly". It closes down with no warning or apology. I reopen one, try one I haven't downloaded yet, and it downloads it, and then launches the little white window and does the EXACT SAME THING. Please help me.