Question mark because I can't reproduce it. Here's what happened:
 
I was working on a mix and recording volume automation for the first time for this mix. When I was done recording the automation on the track and turned off Write Automation, the ProChannel EQ had the gain knob all the way up on every track (none of the busses) for the lowest frequency curve.This occurred even on tracks where the ProChannel was not even enabled previously. None of these showed up as edits in the Undo list, and I had to manually fix the EQ curves on every track, or disable the PC where it wasn't being used.
 
It actually took me a second to realize what had happened when the mix sounded so boomy on playback. I could have sworn I saw a post like this before, but searching didn't bring back anything relevant. Has anyone has anything similar happen?
 
Regards,
Dan