[Xquartz-dev] Some opengl windows blacked out with 2.3.3rc2

I just upgraded to 2.3.3_rc2 from 2.3.2, and everything works fine except for one application (IDL) where all opengl windows are blacked out. If I click and drag/rotate the visualization in the window, the correct scene will flash momentarily but the window will again be entirely black when I stop moving the visualized surface. Everything worked fine with 2.3.2 and earlier versions. Since it is a commercial product, I can't help with any source code examples. Thanks, Martin