I am running Photo Mechanic version 4.5.4 and I run Mac OS X 10.6.6 on my Intel-based Mac.
PM hangs immediately when I select Ingest (actually, cloverleaf-G)...no Ingest menu appears, PM just freezes, requiring a Force Quit. This may (or not) have something to do with the very recent installation of Canon ImageBrowser software that came with a video camera. I've uninstalled that lousy software, but the PM problem persists.
BTW, an interesting side note...I have multiple user accounts on this family Mac and if I launch PM while in my wife's account (and, I presume others, though not tested), this crash does not occur. But I need to fix this problem for my account.
Thanks,
RP