windows movie maker 2.6 problem

Hi

when i open a project on windows movie maker 2.6, and then press play, it plays. But once the video is over, it won't play again. (actually it's if i haven't played anything else or moved anything else yet, it will play, otherwise not.) The play indicator that shows you where you are moves, but the screen just keeps the start of the video. 

I will put a video so you know what I mean: I guese that's not possible, but if it is, i'll put in on.

Oh, and i added a chroma black and chroma white transition to windows movie maker, if that makes a difference.

It would be great if someone could help.

Thanks :)