Alright, here's the story. I run CE at 1680x1050 by adding -vidmode 1680,1050 to the target field in my CE shortcut. In order to play with vsync off, I had to go into my Nvidia control panel and set vsync to "force off". It works most of the time. Every now and then, though, vsync will come on in the middle of a game and lock my FPS to 60. If I alt-tab out of the game, then go back into the game, it'll be off again. Not only is it annoying to have to keep doing that, but alt-tabbing also gives me text lag.
It makes no sense to me. Why is it just turning vsync on in the middle of the damn game, while I'm playing? Does anyone have any idea for how to stop this from happening?