I want to report that I did some testing on this problem on my generic installation of Zenphoto (with Zenpage activated and applied).
For me, I discovered it all depends on if the "filter-zenphoto_seo v1.0.0" plugin is activated or not. If it's off, I get an error when I create a title in a Zenpage article (it creates an extra untitled article). When "filter-zenphoto_seo v1.0.0" is on, everything's fine.
So I guess I'll leave it on