Guys. I have Windows 7 64-bit and am having this issue. Doesn't have to do with W8 I think. Oh, and if anything, IMO, I think it has to do with it being 64-bit. Are you guys running a 32-bit or 64-bit OS or processor?
64-bit, but I can tell you that, being 32/64 bits won't be the problem.
People got screwed after the update at the XIGN files / GameGuard. Everyone has different processes running, and some minor process might be conflicting with GG.
Weird thing is, I thought it was semi-related to Windows 8, but I can see that other Windows versions were affected too.
We will have to wait for the patch since the community couldn't find out a solution for it.