Lag, or screwed up update?

I can't use my mouse to rotate the camera angle anymore without it skipping or doing (several) complete rotations and all around pissing me off. Was there an update that made the game less compatible with my mouse, or is there just crazy lag today (and yesterday) that's interfering with my connection?

My mouse works perfectly fine, otherwise.

I think it might be lag, I've had quite a bit of it in the past couple of days, but we're in different countries so who knows. There's been a couple of times when I would rotate but it wouldn't move, and then suddenly it'd jump and I'd start walking or something.