I was talking to a fellow that was having problems like this. Make sure you're in 16 or 24 bit color and that your screen resolution is in 4:3 (i.e. 1024x76
If you have an absurdly high resolution try dropping it down.
I think his issue was using a widescreen resolution meant for his widescreen monitor and that was causing issues for whatever reason.
Edit: that is assuming you're using titanium of course!