I'm using Unity 3D with two monitors running off my ATI card (I'm using the proprietary driver) on Ubuntu 12.04.

Whenever I move my mouse downward, as if to go "below" the screen, it disappears rather than being stuck or bounded as it should be. When I move the mouse back up, after a delay it always reappears in a different position (at the bottom right of my left-hand monitor). I have sticky turned off in display preferences.

Anyone know how to stop this?