I got that error when trying to click on page 2 of my site.

Zenphoto error: missing theme page.

The first page shows correctly.

I just had zenphoto installed without any mods

Possible cause ?

Try disabling mod_rewrite in the admin options.

it works, but I had it working with the mod_rewrite ON 2 days ago,
I just did a fresh installation and now it dosen't work anymore.

Issues ?

problem solved... thanks !