UPDATE: Files won't play on one machine

I booted the Mac Pro from the SuperDuper clone of the laptop. Using the CatDV installed on the clone everything was fine. It could read the master files on the server, and then generate and playback proxies.
So what do you think? Apparently a software problem installed on this particular Mac Pro. Note that it did work correctly a couple of weeks ago. The only thing I know I changed was updating the copies of CatDV. Note, too that CatDV is working fine on all the other machines.
Robb

Non-linear: all the time and nothing but.