Updated with
Zenphoto version 1.4.3-BETA [10268] (Official build)

refreshing the database and some tags are appearing !

Not all of them, but it's a start

You should do a metadata refresh to force Zenphoto to look at all the images for their tags.

It appears to be working now.

Thanks for the help.

Thank you for reporting the problem. We did not know it was not working until your posting.