Pro Audio Support

I'm using an M-Audio NRV10 with Pro Tools MPowered on Mac OSX 10.4.10, and every time I try to record I'm getting an error that says "Problem detected with audio clock, check your clock settings." What can I do?
In one case, this was resolved by raising the H/W Buffer Size in Setup > Playback Engine to 1024.

If this doesn't work, uninstall and reinstall Pro Tools (making sure to choose the standalone version of Pro Tools MPowered if you're using M-Audio hardware) and re-try.