<p>I just encountered this bug on the Linux version installed from the Ubuntu PPA. After adding a video to my service I lost the saved service and I found that the file has a size of 0 bytes. I recreated my service sans video, saved it and created a backup copy. Then I added the video again and saved it, and again I got a 0 byte file. As far as I can tell OpenLP takes all the content needed for the service and rolls it up into a zip file. I'm not sure if this is a good idea or not for video files, but I'm guessing that it has trouble with the video file for some reason and it ends up producing a 0 byte file.</p>