(Note: "reply"ing to this email may cause a bounce... since my mail client may still be misconfigured. The correct email address is at bottom of this mail) I won't repeat a lot of typing which I have already done, here's a handy link which explains the issue: http://bugs.gentoo.org/show_bug.cgi?id=34858 Here's some random extra information (not necessarily on the page in the above link): -- uname -a: Linux theferret 2.6.0-test9-gentoo #2 Sun Nov 9 15:57:51 GMT 2003 i686 AMD Athlon(tm) XP 3200+ AuthenticAMD GNU/Linux -- gcc version: gcc (GCC) 3.3.2 20031022 (Gentoo Linux 3.3.2-r3, propolice) -- glibc version: 2.3.2-r9 -- XFree86 version: XFree86 Version 4.3.0 Release Date: 27 February 2003 X Protocol Version 11, Revision 0, Release 6.6 -- Compiled from: hugs98-Nov2003.tar.gz (source) This problem did not appear in the Nov2002 sources, but then I don't know if those sources had threading and hopengl support. I have tried compiling using default xfree opengl headers and interface, and that works fine. Maybe the fact is that the nvidia drivers just don't support threading? Thanks.. -- James Noble