Which openGL version(s) do you use?
If you don't know what version, just start PyMOL and look for the following:
GL_VERSION: X.Y.Z VENDOR AAA.BBB.CCC
and vote for the "X.Y.Z" part. If your "X.Y.Z" is "3.3.0" for example, please select "3.x" for that.
You may vote for multiple versions.