I am having the same problem on a Mac. When I launch a pack it goes to a white screen. I'm getting this error message about 8 times:
Aug 4 14:13:01 Cow.local java[87761] <Error>: CGContextGetCTM: invalid context 0x0
Aug 4 14:13:01 Cow.local java[87761] <Error>: CGContextSetBaseCTM: invalid context 0x0