"extension "GLX" missing on display..."

[Will Maier <willmaier@gmx.net>]

Hi all-

I'm running unstable/Knoppix3.3 on a pretty recent set up; I got the 
most recent nvidia driver last night and successfully installed it 
(following the instructions; I did rename /usr/lib/tls to tls.OLD, as 
suggested on a thread somewhere). Things worked well: I was able to play 
the UT2004 demo right away. I rebooted my computer, and now I get the 
following error:

Xlib:  extension "GLX" missing on display ":0.0".
Error: couldn't get an RGB, Double-buffered visual

This happens if I try running glxgears, ut2004demo, etc. I didn't edit 
my XF86Config between installing the driver, rebooting and trying to run 
GLX programs...and I'm fairly confused as to what I should do. My config 
file is all in order...I get the NVIDIA splash screen when I run startx, 
the desktop looks fine, etc, which suggests that the module is loaded 
alright.

Any ideas? I can post my XF86Config file and glxinfo output, but I don't 
want to take space up; can on request.

Thanks much!
Will Maier