I get the same lock-ups with my ati tv wonder. Is it a known problem with 3dfx cards. I have a voodoo3 3000. I've got dx 8 and the NEW voodoo drivers 1.0.6 and the same thing.
edit: i've got ati player version 5.3
I'm not sure if there is a newer version or not. You can't download it, you have to order it from the ati website. I did anyways.