I am having an issue with WMM - it is not showing ANY pictures or videos that I have added to my .wlmp file. However, I have 41+ minutes of video in there, but instead it is acting like I have zero.

When I go into the 'View' tab and change the thumbnail size, I get this message (and then Movie Maker closes immediately after):

Why is this happening? How can I fix it? Any help would be appreciated.Thanks in advance.