Acidfree videogallery is broken after backup

I have realized a videogallery with acidfree

All works fine until I make a bakup and load it up. Then the video gallery is broken. That means the video prewiev is replaced by title of the video and I get an error "filemanager/active not found" in the watchdog entries.

I dont know if its a acidfree bug or a bug in filemanager