installed c7pro from 3dartist CD (mac app, windows native content), edited app package (10.6.x).
I found that trying to install from 3dworld dvd caused various crashes (ppc, 10.4.x), but installing
from copied folder worked o.k.  no permissions issues seen in either 10.4.x or 10.6.x.

you know the drill.  startup from macbook install dvd, run disk util, repair drive, repair permissions,
restart from macbook drive.  if it still doesn't work, they've got an url in micro type on the sleeve:
futurenet.co.uk/support, but I daresay, as always, mac users must be self-supporting.