Whenever I enable Compiz effects (in the Appearance window) the bottom of the screen is cut off (about 1/5 or 1/4)
Basically, when you first do it the strip being "cut off" is invisible, and if you leave it like that and restart it turns the color of your background.
It's the equivalent of gluing a piece of paper over your moniter, everything still functions perfectly under it.
If I turn all the effects back off, it goes back to normal, if I lower the resolution, it goes back to normal. (using a resolution lower than 1280x1024 with my moniter size is out of the question)