I had the same exact issues you have with my setup. The game ran, but no startup sequences and weird video saved games.
I installed the Wicked GL driver and followed the instructions and it runs great! No problems.
Before my Voodoo 5, I had a Geforce DDR card. That thing would lock up so fast. But that voodoo card is stable, stable, stable. I am going to be so sorry, when I finally have to give it up. With the WickedGL, I get to keep it a little longer.
"Only the dead have seen the end of war. "