There's been a lot of posts in the last day or so where people are missing a step or two during the zenphoto setup process. This may help those in need.
First thing, you need to ensure your host or ISP has not enabled PHP Safe Mode. If so (quoted from Tristan, the developer of Zenphoto):
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[*]Contact your host and tell them you want Safe Mode disabled, and point them to the following site: http://www.php.net/manual/en/features.safe-mode.php
[*]PHP with Safe Mode on is basically debilitated, so I wouldn't pay for it if I had a choice. It is of course up to you though.
[*]I'm working on a safe-mode compatibility mode for the next version that doesn't create new folders. That may help. In the mean time, you can also go back to version 1.0.3, which uses an old method of storing processed images that's more compatible. You can find it in http://www.zenphoto.org/files
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After you've verified that, then double-check that you:
1. Downloaded files for latest zenphoto release
2. Uploaded everything to your web server (including .htaccess file in root zenphoto directory)
3. Changed zp-config.example file to zp-config.php and made modifications as necessary.
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[*]Make sure you set mod_rewrite to true if you wish
[*]Make sure you set your admin information, and your correct DB information (including the prefix if you have one)
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4. Change your rewrite-base in your .htaccess file to your root zenphoto path.
5. Make sure you have an albums and cache directory (create them manually if you don't) and chmod them 777.
6. Upload the pics you want into your albums dir, and organize them how you wish in folders and subfolders (zenphoto will handle the creation of the subalbums if you're using the subalbums testing-dev theme)
7. After this is all done, go to http://www.yourwebserver.com/zendir/zen/setup.php and follow the steps. This sets up your DB and gets everything ready. It then will allow you to either administrate or view your gallery. I suggest administration, check your theme, I usually run "refresh" (garbage collection) on the Overview page just for kicks, and then you should be good to go.
8. Have fun with your pictures.
If you've done all this, and something still doesn't work, write back and let us know.