I backed up up Dredd vs Death from my PAL retail copy to my modded PAL xbox by FTping directly from the dvd drive on the xbox to my PC, then back again to the xbox, as Xboxcopy didn't seem to like it (failed after a number of files). It worked fine up until the level 'Icarus Labs', which fails to load properly, returning to the title menu of the game(not the dashboard).
The other modes, and earlier levels work fine.
I remember something similar happening with Agent Under Fire, (fails to load after level1) but I traded it in ages ago so I can't say i care about that one.
Also, Kung Fu Chaos on the hdd gives a 'dirty disc error' when I try to start a full single player game, but works fine in multiplayer mode.