HD Native -9219 Errors

[KMcK]

Been getting pretty regular -9129 errors since upgrading to HD | Native a few months back. I've been trying to nail down a cause but to no avail. At first I thought it had something to do with incompatible video codecs, but it's now happening even in sessions where I have no video track at all! It's very random, a session will stop with the error in a certain spot once, but then play back through the same section fine every other time, only to stop and pop up a (-9129) at some other random point in the session. So it's never directly reproducible, but it pops up often, like a couple times an hour often. It can happen in a session with a single stereo track and nothing else, so it doesn't seem to relate at all to how hard the computer is working.

For the record (since I couldn't find any trace of this error number anywhere else in the DUC), the full text of the error message is:

"Audio processing could not complete due to conflicts with other CPU tasks or a potential clocking issue. If this occurs often, verify your sync cables or try changing the HW Buffer Size setting in the Playback Engine dialog. In most cases a larger HW buffer size will prevent the problem. (-9129)"

I always run at 1024 buffer, so increasing that isn't an option. I've tried toggling/changing every other setting in the playback engine dialog and nothing there helps the issue. I have no other software running, and no plug-ins active in the session. I've trashed prefs, re-installed PT, tried different hard drives, CPU settings, DAE buffers, nothing seems to be related as the error will pop up regardless.

I've actually decided to move up to an HD3 rig b/c I've decided Native isn't reliable enough for my needs (can't have the music rig dropping out of playback a couple times an hour for no reason during a dub mix), but was just wondering if anyone else has seen this issue, I'm hoping it doesn't continue to appear once I go TDM.

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2008 Mac Pro 2.8ghz 8-core 16bg RAM / Mac OS 10.6.6 / Pro Tools HD Native 9.01 / HD Omni IO