What I've found with Cedega 6.0 and the Nvidia drivers are:
9755 - AA on (In say HL2) I get tearing when I enable it. (Can't see anything properly)
100.14.09 - With AA on, it inverts the game.. Turn it off, it's normal again.
So for now I leave AA off, so I can play the game... (Using the 10.14.09 drivers)
In Doom3 (Native) I actually get a FPS boost of 10-15fps.. With the 100.14.09 drivers, with doom3's default timedemo.