I have this problem with an s3 savage card on an ibm machine Windows 2000. OpenGL is not able to render onto a portion of the viewport. A set of rows at the bottom and a set of columns at the right side is left unrendered (even by glClear command).
I also noticed that opengl commands, when used without enabling depth test, are able to render onto the portion of the viewport mentioned above.
The same exe works fine on a compaq machine NT 4.0 and different display card.
Does anyone have any clue to what could be happening??