Ok... If i happen to let my cutscene go until there is talking and i hit esc... the game freezes and has to be Alt+Xed out of... my speech is set to no auto remove... I know it does it on my game.... so.... just reporting it
I think you just answered your own question.
The cutscene feature basically turns the game speed up to 1000 fps until EndCutscene is reached.
If you have no auto-remove, EndCutscene will never be reached.