Yep, I have same problem.
GeForce256 ( guillemount 3D Prophet) 32meg
using Guillemount 14.10 drivers.
runnng in ANY 32 bit mode results in same result, chocalate background, that starts black.
any 16bit mode works fine.
turning the new Slow text fix on appears to SPEED up the process.
Windows 2000 professional
K6/3 450Mhz CPU
Epox board with MVP3 chipset
I get rocking 23fps at 1280x1024!! you go MilkDrop!