Upgraded to 1.4.4.3 and discovered an issue I'm having while adding tags either to an individual photo or to a number of them using the "Bulk Actions" option. See here for video:
http://screencast.com/t/BwJGoub2qpI ultimately end up with the following error message:
The Zenphoto object you are requesting cannot be found.
Album: zp-core
Image: admin-edit
Comments
I suspect that there is a limit to what your browser/server will allow in a "POST" operation and that 60 images has exceeded it. Try the same thing with fewer images on the page.