I didn't use this tool, I always use DiskEx for DM, and both Mario Golf and Batman Dark Tomorrow would freeze in the GC Loader screen if compressed, however non-compressed they both worked fine, and yes I did try different isos with the same reasult and asked around about Batman Dark Tomorrow with the same answer, so how you got the game to work while compressed is beyond me but it didn't work for me!
Very strange then because I tried to start a uncompressed image of Mario Golf (PAL) and it just hung up an the DM splash screen.
No matter what I try (different DM versions, different loaders) always the same problem.