Okey, but try to update the drivers for your graphics card, use the Cataclysm (for ati cards) or Detornator (for nvidia cards) drivers. And if it still doesn't work let me know.

What you can test is downloading and compilin anoter delphi OpenGL app and se if the same problem is there, in that case delphi may have crasched and needs reinstallation, test with some of the apps here: http://www.sulaco.co.za