Hello,
It has happened twice to me already. It has happened both times with the Airbus X Extended 1.10. It happened in the LatinVFR MDSD and at Default KEWR. It also happened in LatinVFR Bermuda.
What happened was that I requested PB. Everything got set up. GSX asked me to release parking brakes and I did. Then I noticed I was not moving. The marshler was moving. The aircraft and the Tug both sitting still. I hit CTRL F12 asked to cancel pushback I did. Tried to access the menu and it did not pop up. Looked in the taskbar and Coautl Engine was not there.
Thank you
Alcides Segovia