Maybe what PiCTuREm3RolLin is referring to is not the refresh problem, but an annoying thing where parts of the screen "shift" for a split second (for lack of better way to describe it). This happened to me too since I've installed the newer drivers. Although in my case, it only happens in the pre-game menus, but not the game itself.
At first I thought it was because I o/c my video too high, but lowering it didn't help.