OK........I just ran a test to see if it worked on mine. It did work. Here is what I did:
Insert pictures into movie time line>
Select all pictures in the movie time line>(select the first picture then scroll to the end of the time line hold shift and select the last picture.....this will select all)
On the left hand side right above the time line there is a "slideshow" button> Is that what you have been selecting?>
Select slide show button>
Select the motion theme>
then play movie to see
Please forgive me if you have already been trying this route.
If this does not work you will more than likely need to do a uninstall/reinstall
Through Christ,
Chris