Movie Maker 6.0 storyline will not play

I put together a storyline from some vacation photo's and clips, playing the
storyline along the way and all went well. After adding transitions to all
the frames except the first (which is a video clip) the storyline also
played. After adding an opening transition to the first frame the storyline
will no longer play. I tried removing the transition and restarting my
computer, nothing seems to work. Any advise?