Do you have a 16bit screen mode in the resolution you want to use? normally 640x480 is the default for Warp3D Games. You must have a 16bit screen mode, it might even help if you launch from a 16bit Workbench.
I use a Voodoo 3 with my GREX but I have used a Voodoo 5 with my Mediator setup and that worked with Warp3D so I'm sure the Voodoo 4 should.
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