Hi,
maybe these links to OpenGL forums are of any help concerning my problem with OpenGL not rendering unless "Aero" theme (a theme with window compositing) is selected in Windows (Server 2008 R2)
The links (to forum topics):
http://www.opengl.org/discussion_boards/showthread.php/171194-Partial-Render...
http://www.opengl.org/discussion_boards/showthread.php/165975-broken-window-...