one thing you may find is some warp up apps don't like powerup. i only switched on the powerup emulation to run UAE on workbench to play the old games.
also, i don't know if it was just me, but i had hells own problems with warpup version 5. dunno if 5.1 is any better, but to get wipeout to be playable, ie work, used to install version four. ok it was old, but it worked.
sorry to say but it was the one thing that naffed me off with my miggy, the fact that the software upgrades seemed to just make it more and more unstable. oh yeah, and wipeout doesn't like some of the higher versions of warp3d either. fun huh. :-P
the only reason i had for running warpos 5 was for the iMAC emulation....