This is a very rare bug and we are aware of one workaround, thanks to one of our users. While the game does not allow Alt-TABbing, you should be able to switch to the Task Manager and then go back to the game - this should allow the movies to render properly.
You can launch the Task Manager in two ways:
Press Ctrl-Shift-Esc, or, if that doesn't work,
Press Ctrl-Alt-Del and click on Task Manager.
Do you have more questions?

Didn't find the answer you were looking for?
We will do our best to respond as quickly as possible. On weekdays, we normally reply within 24 hours, but during weekends we can only respond that quickly to high-priority, time-sensitive cases. All other cases will be looked into first thing next week.
Contact us

Want to get help and maybe make some new friends?
We’ve got a great community here on GOG, which is always eager to help out. Please make sure not to share private data on public forums, though!
Ask our community