There may be a problem with your source files. Have a look at this URL to
see if your imported files are among those listed as being incompatible.
http://www.myvideoproblems.com/Tutor...patibility.htm
Also -- You may get a more direct answer to your question in another
newsgroup:
microsoft.public.windows.vista.music_pictures_vide o
"JennyAnnJ" <> wrote in message
news:20BEE548-86B3-44C8-B76A-...
> The movie maker timeline will stop playing when I do things like add a
> transitions to the movie. I tried the help online but it was not taylored
> to
> vista so it was no help. I am sure it is a vista problem with security.