What is the bug that's needed the most testing to lock down so far? What was your toughest bug to isolate?

I would say there's one. I do a lot of the testing for the FPS module. There's one with weapons that has come and gone several times where the stock on the gun disappears and when you aim down sight the back of the gun just goes invisible, and it's just like a culling issue. That's one that we've had to deal with for a while. It's just because we have different builds, a profile build and a release build, and it's only happening on the release build and not the profile, but the developers work in profile builds, and so it's kind of hard to reproduce. But they're finally making headway with that and knocking that out. A bug that lasted way too long, you guys are probably all familiar with the broken hand in the buggy, which is now no longer an issue, which is really nice.