Part way thru the job, I noticed that a wrong nozzle was being selected. (I had the wrong one configured in the job) I hit the pause button as the nozzle change was being completed and then hit the hardware reset button (emergency stop button).
I then went to restart and went thru homing. Once it was finished homing it proceeded immediately to restart the job from where it stopped. I think the vacuum didn't engage but everything else continued. I believe I observed similar behaviour before. So I again hit the Estop button and recovered things.
So it looks like there may not be a clean break (recovery) when pause (and/or Estop) is pressed during a nozzle change as a job is running????
The good news is that the job went much more smoothly with the best placement performance for me to date - maybe the operator is improving

Panel is just out of the oven now as I am typing this & only a couple of issues caused by the application of paste. If I continue to maintain the current performance it will get lots of use & bye-bye placing by hand

Q: This panel has real fiducials (vs TH fiducials before) and is longer in both X+Y. I wonder do one or both of these factors improve the actual placement accuracy? Of course it could also be related to the circle size feature being more accurate.