MacGLide - 3Dfx hardware emulation

I hope you're still alive, oh great... Umm... Maker of MacGLide ;)

I just got the MacGLide and then I tried to use it on Falcon 4. When I try to start a flight in it using the Glide for graphics, it just shows an error message that tells:

Error: 1958 Gr3dfx.c Jun 22 1999

DevCreateSurface: grOpen failed!

However, the game still works with the software graphics.

I'm using a 1GHz eMac with OS 10.4.10 with 1GB RAM and ATI Radeon 7500 with 32MB VRAM and the Falcon is of course used in classic environment.

Oh yea, did I also mention that the Hard Drive is... Don't know the english word but should I say split into two (not physically ;)

So thanks for help.