If you experience problems with alt-tabbing - like the resolution doesn't resume to your desktop-resolution then you should try the following variable on your r1q2-console:
--> R1CH ([email protected]) has joined #aq2world
<R1CH> if anyone happens to be using r1gl and found alt+tab broken after latest update, new version is out
I tried this before. When I alt-tabbed back to Q2, it looked like a massive clipping error and everything was merged into everything else. I tried to make a screenshot of it but it came out normal.