This has been narrowed down to be caused by Enterprise security software running on machines in our case.
Cause: ESRI Drone2Map code and py scripts that do non standard (funky) operations. Enterprise Endpoint protection software on all corporate machines blocks these processes... Drone2Map just thinks the processes are finished.
Symptom: Press Process >> approx 10 seconds program says '100% complete'.
We are deep in investigating the 'exact' cause. But it is narrowed down to Software blocking whatever Drone2Map is doing - which looks like malicious activity.
Hypothesis is around that Drone2Map has buried calls to get blanket licensing from Pix4D authorizations and it looks suspicious to protection software's so they block the process. Capturing of the error of course is non existent through debug mode in drone2Map and Tracing is a time consuming process consuming many hours of our time.