With minimal plugins and 2% total CPU displayed on the System Usage meter AAE -9173 abruptly cancels a real-time bounce stating ProTools ran out of CPU power yet offline bounce yields no such error. One DUC user pulled all 3rd party plugins out of the AAX folder with the same results.
Rolled back to 11.1.3 and can bounce real time with no issue. 11.2.x problem.
Referenced here: http://duc.avid.com/showthread.php?t=357286