I run my OpenGL program in a picture-element which is in a Dialog-Box. All works fine... but if something like a message box or an other dialog is in front of my OpenGL output window then this dialog box is overdrawn by the OpenGL output. Sometimes it doesn''t occur and all look''s fine and on a friend''s computer all looks always fine... that makes me totally crazy!! I programmed a game and this problem occurs in the editor. The game is called ''Convey'' and could be found on my homepage: http://ablazespace.exit.de/ (maybe soneone could test if this occures on his system, too?) Maybe someone has this problem, too? Could someone help me??

Maybe some more information about my dilemma:
Some days ago, all was fine. Then I reinstalled my system and since this time
the terrible overlapping error occurs. I installed the newest Nvida diver, maybe
is there something wrong?
Any idea to solve this problem?