[Avid-L2] A puzzle for Geniuses: Mac Error -43 (File not found)

OK, here's one I just can't figure out…

I have a MC 5.5.2.1 running on an older Mac Pro (2.66GHz Dual-Core Xeon with 6GB of RAM and OS 10.6.6).

Often when the system is just sitting there doing nothing (let's say I leave it there for a while and go get a cup of coffee), when I come back I'll have an Avid error message on the screen that says:

Mac Error -43 (File not found)

If I click on the OK button, usually I can continue working. Occasionally it crashes. But… what's up with that? A Google search has returned no hints. Re-installing the software doesn't seem to help.

I do have a Matrox MXO2mini installed, but the system was doing this before I installed the hardware, so I don't think the Matrox is implicated.

Any ideas out there?

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