Intermittent digital clipping on armed tracks

[slowdive]

I've searched the DUC for this one, and found no previous answer to this issue, so I am posting this for some assistance:

I am running PT 6 (the version of PT6 right before 6.4 came out) on a Digi 002 Rack with OctoPre, which is running on a G5 Dual 2Ghz w/OSX 10.3.2

I imported some audio tracks from CDs I'm well acquainted with to see how my room sounds, etc. This worked fine. When I decided to arm some tracks via the OctoPre to test out our drum kit, I started getting what I would call "intermittent digital clipping." I would sit in dead silence, watch a track that is armed for recording, and watch as the input meter would clip in the snap of a finger, then go away for 15-20 seconds before doing it again.

I have used the Digi 002 Rack and OctoPre with no problem when I was running in earlier versions of OSX, PT6 on a powerbook.

The best way for me to describe this -- if I'm remembering my old Mbox woes correctly -- is it is the same clipping sound the Mbox would make if you ran a session for more than half an hour (in Mbox's infancy of early 2002). There was a patch for that, but nothing for what I'm experiencing right now with my current setup.

I have trashed DAE, OSX, and PT preferences, repaired disk permissions...I just don't know what to do to bring silence back into my recording realm.

-Marco B.