Problems to start simulation from PzPP [PickMaster 5]

I get a Fat green bar floating across my screen 70% of the time that I try to Start a simulation in the palletizing power pack under 5.15.00.01.
It is actually the green bar that is normally running on the bottom of the screen.
This also occurred in 5.15.00.00.
If I could only figure out what to avoid doing just before I press the start arrow in the Simulation under the palletizing Tab, that causes this. I would get much more accomplished.
(There is no way to recover, and since I must restart to recover, there are no files to upload to show what state robot studio is in to diagnose this.)

Moved to new topic in PM5.