The website of our client is build on this CMS some years ago. When the client came with a feature request yesterday there was no one left from the old team that has experience with Zenphoto so I'm trying to work my way through it, but it isn't going as planned.
The client has a gallery full of photos and now wants to add an album with .mp4 videos. If I'm correct the gallery should support video files. The files uploaded and the videos showed up as thumbnails, but pressing those thumbnails do not result in the videos being played.
My feeling is everything is a bit buggy. Even images don't load sometimes and just adding one video file instead result in four broken thumbnails that do nothing.
I've tried disabling and enabling different plugins like flowplayer3, but to no avail.
Can somebody help me with this? My effort can be seen at the following link:
http://www.willylippens.nl/gallery/ 
Zenphoto
Comments
I fear it may exceed the forum posibilities to help with such a custom theme. The site seems to use a lot of JS for display. So it might be a JS conflict. Flowplayer3 used jQuery and flash and calling js within js most likely causes some rebinding issues.
Try an official theme and if it works there it is your theme.
Unnecessary that the site should be upgraded.
<link removed by admin>
As to the version of Zenphoto, there is only on "version" of Zenphoto you can download here:
http://www.zenphoto.org/