Still not working! The only way I can get it to work is to enable software rendering at a super-low resolution. Not fun.
I managed to get myself a copy of Q3 (Thank you Valve!), and it works JUST FINE. I also tried World of Padman - that doesn't work. Maybe it's something about these free-software releases that my computer doesn't like?
Here may be the lead for the smoking gun:
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\system32\opengl32.dll' ): succeeded
...setting mode 6: 1024 768 W
...registered window class
...created window@107,80 (1030x800)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 32, 24, 0 )
...0 PFDs found
...MCD acceleration found
...PIXELFORMAT 1 selected
...creating GL context: succeeded
...making context current: succeeded
etc.
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\system32\opengl32.dll' ): succeeded
...setting mode 1: 400 300 W
...registered window class
...created window@287,250 (406x332)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 32, 24, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 32, 24, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...WARNING: could not set the given mode (1)
...setting mode 1: 400 300 FS
...using colorsbits of 16
...calling CDS: failed, restart required
...trying next higher resolution: failed, restart required
...restoring display settings
...created window@287,250 (406x332)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 16, 16, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 16, 16, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...WARNING: could not set the given mode (3)
...shutting down QGL
...unloading OpenGL DLL
...assuming '3dfxvgl' is a standalone driver
...initializing QGL
...WARNING: missing Glide installation, assuming no 3Dfx available
...shutting down QGL
WOP and OA have different resolutions set, but the basic gist is the same. And yes, this is with the same hardware and drivers. Wonder what's with the disparate difference?