I just upgraded to 1.0.5 of Zenphoto and now for some reason the slide show feature is not working anymore (the slide show is from the Thinkdreams theme). I get the following error whenever I click the slide show link:

Zenphoto error: image does not exist.

Also, I'm getting a constant error call of the following in the error logs:

PHP Warning: Zend Optimizer does not support this version of PHP - please upgrade to the latest version of Zend Optimizer in Unknown on line 0

Apart from that everything else seem to be working fine. My gallery is here: http://arthedains.com/portfolio

Does someone know what is going on here? Many thanks in advance!

The slideshow looks like it needs a mod_rewrite rule in .htaccess, which probably got overwritten by the upgrade. See if you can find install instructions again for that, it'll probably say what to do.

The other problem is definitely with your configuration -- Ask your host about it, or find some way to turn off the optimizer or something.

Thanks a lot Tris, I solved the slide show problem. It was exactly as you suggested.

As for the optimizer I've no idea how to turn it off so I'll shoot off a mail to my hosting guys first. Thanks once again for your prompt help.