Below are the 2 outputs: Incidentally a SAX configuration causes a crash where YAst2 does not. Thanks Again thom@linux:~> rpm -qa|grep -i xf86 xf86_glx-4.2.0-107 xf86-4.2.0-64 xf86_3x-3.3.6-375 xf86tools-0.1-221 thom@linux:~> 3Ddiag 3Ddiag version 0.397 Verifying 3D configuration: Using 3dinfo ************************************************************ Verifying 3D configuration based on XFree86 4 for 3D board "ATI Technologies Inc Radeon VE (1002@5159)": Tests for package "xf86_glx": package ... done. package files ... done. Tests for correct OpenGL libraries/GLX extensions: Symbolic Links ... done. /etc/sysconfig/3ddiag (SCRIPT_3D=switch2xf86_glx) ... done. Test for correct XFree86 version ... done. Tests for XFree86 configuration: Config File /etc/X11/XF86Config ... done. Driver ... done. Color Depth ... done. Extensions ... done. Options ... done. ----------------------- NOTE ----------------------------------- If 3D hardware OpenGL configuration is not stable enough, you should switch back to 'Mesa Software Rendering'. You can verify this configuration with the command "3Ddiag --mesasoft". ----------------------- NOTE ----------------------------------- Checking GLU/glut runtime configuration: GLU ... done (package mesaglu) glut ... done (package mesaglut) thom@linux:~>