I managed to solve a bit more of the lockup puzzle last night... looks like missing libraries. I'm running Debian unstable; and it seems they package the Mesa libraries in a couple of packages, and don't tell you which ones you need. :( after I added the xlibosmesa3 package ('offscreen rendering for mesa'), I can now run for about 1/2 hour before the screen freezes. (instead of 1-2 minutes). here's the mesa stuff I have installed: chrome at steel:~$ dpkg -l *mesa* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==============-==============-============================================ un mesa-dev <none> (no description available) ii mesademos 3.4.2-1 Example programs for Mesa (and OpenGL in gen pn mesag-dev <none> (no description available) pn mesag-glide2-d <none> (no description available) pn mesag-widgets- <none> (no description available) pn mesag3 <none> (no description available) pn mesag3+ggi <none> (no description available) pn mesag3+ggi-dev <none> (no description available) un mesag3-glide <none> (no description available) pn mesag3-glide2 <none> (no description available) pn mesag3-widgets <none> (no description available) pn xlibmesa-dev <none> (no description available) ii xlibmesa3 4.1.0-9 XFree86 version of Mesa 3D graphics library pn xlibosmesa-dev <none> (no description available) ii xlibosmesa3 4.1.0-9 Mesa/XFree86 offscreen rendering library Any idea what I might still be missing? Carl Soderstrom -- Network Engineer Real-Time Enterprises (952) 943-8700