Zenphoto 1.2.2 [3131],customized default theme.

I'm using this code on my index.php to display a random image from a specific album.

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When I change the image description in the frontend, it will not save and disappears.
After a refresh from the browser the old description shows again.
Through the backend everything works normal.
Definitely no big problem. Just curious.
Any ideas?

Anyone ?