Hello, I am having problems with X window rendering and GLXFBConfig. If I try the choose a GLXFBConfig with attribute GLX_ALPHA_SIZE,8, then I get an error. I checked this and it seems that I don't have an XVisualInfo which has a alpha color buffer different from 0, although xdpyinfo gives that I have 12 visuals. I have a quadro FX 500 graphical board, and I tried already to install the latest four nvidia drivers for it. Nothing helps. I am just changed from redhat 9.0 with nvidia driver 1.0-4363, and there I had no problems. Does someone know how I can get the appropriate visual, and can solve the problem? Indra Geys