I've fixed the problem. After realizing, thanks to you, that I didn't have adveffects I went to the main page and downloaded all the vp files there. For some reason these were not included in 3.6.7 although it was my understanding when I downloaded it a few days ago that they were. Afterwards I immediately noticed a dramatic improvement in the graphics and, most importantly, OpenGL began working. I changed to that card and now experience no crash when a ship explodes or beam is fired. Minor slowdown sometimes, but it looks too pretty to do away with and get that beamfix patch :-).