Hi,
there is a solution: reset the graphical interface by hitting ctrl+shift+del.
yes, yes, I've been myself told that it's a known bug of ANSYS. I thought it was solved in v10 as since I left v9 for v10 this annoying thing doesn't bother me any more; it may be that this error is due to bad handling of the video drivers, and release after release they fix the bug for more and more drivers...
Hope this helps...
regards