I think it was discussed before and the conclusion was that the bug is wx one or gnome/gtk one, don't remember...
You can hide the panel or
you can move the window with keyboard + mouse like this:
1. press alt
2. press the left button inside the window you want to move
3. move the mouse and the window moves, too
p.s. there is 10.05 release, you could try it (the bug is still present, I think).