I was hoping on a working sequence this Thursday which I was sure I could do with SCS. But for some reason it doesn't work

Setup is easy. Sequence has two entries. First cue is a movie of about 5 minutes. Second cue is a still image, linked to a toggle hotkey.
I want to show the movie and at certain times show the still image. After the toggle, the movie should be visible again (preferably it should stop during the still image, but did not test that yet).
My problem: Movie starts ok. After hotkey still image shows. Again hotkey my screen goes blank, although SCS seems to think the movie still runs? So how do I make the movie show up again?
EDIT: I did try with an avi created with the suggested software, same result.
Regards,
Peter