This is problem I've been having for a while, but it's a bit hard to describe. Basically, sometimes when trying to simply move my mouse around the vertical movement gets locked or some shit, as in I can't move the cursor up or down despite doing that very action with the mouse. I've tried fiddling with the mouse's sensitivity setting but it doesn't seem to help at all. It gets in the way when I play games as well and it's really pissing me off. The mouse is a razer naga epic, and wired.