game development is very complicated. becasue the PC version is not fixed to a certain processor, memory, and video card/solution like the consoles, maybe something was overlooked on the PC which is not a hardware fixed platform.
Borderlands is not a PC game, it's a multiplatform game and i'm fine with Gearbox taking some time to fix something they find unacceptable for the PC version. this news is much better than the "we'll fix it with a patch" we get from a lot of devs. besides, Gearbox has not let me down before. it could be anything, a broken animation, to driver issues. have some faith in such a good development team.