I ended up having to delete those ".abc_macfiles.jpg" everytime I opened a folder in ACDSee where they were located the program would just sit and think forever. I couldn't rename them and I couldn't even delete them through acdsee, I had to use windows explore to remove them from my computer.
Hopefully this is what is making your psp hang up, I bet it is trying to understand and catalog those files.
Glad we are here and can help, as Jane said I don't think this is a PSP issue except it is having a issue with certain Mac files.
