@Thomas
Ok, so you say that the PPC demo of Gears work?
Please post your ENVARC for Mediator, PowerPC and Warp3D and the versions of the Picasso96 libraries. And if possible, also your jumper settings for the Mediator bridge board.
As for WipeOut, can you run it in full screen, or are you limited to a window? I always get corrupted graphics on the first screens :-(