I installed zenphoto version 1.2.1 a few months back. It has been working perfectly until the other day, when I had to change the php version on the server to 5.2.9.
Now, when I try to access the gallery, I am receiving "500 Internal Server Error." Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

How should I handle this issue without the risk of losing my custom style sheet and images?

Thank you!

If your style sheet/images are named differently from the zenphoto ones, just install the new zenphoto. If you have just modified zenphoto files you will have to save off your modified files first.

In either case it would be a good idea to compare your css to the equivalent one from the release to see if there have been changes made.

But, I would not expect the change to php version 5.2.9 to be the source of your problem. What else did you have to do?

It appears that it was a permissions issue. The issue was resolved by a tech at my host; he changed permissions on all files to 644 and on all folders to 755. He said is required by php5.

Thank you for your response - I appreciate it.