I did not replicate the Error.
I dont have any Save. (Is there even a Save/Load Option?)
CoopMission (1/4) Black Day (First mission from the Main Game Expansion)
Played as Cybran.
I refit a SubCom seconds before and or while a cutscene started.
I was stuck in the "Do you want to remove the installed Modul - [Y/N]" Popup Window.
No Access to any UI Options.
No Shortcut functioning.
No Unit selectable.
Could move map via keyboard.