I just found what seems to be a bug: if an album name has accented characters, for instance french accents, 1.2.3 simply ignores the album and does not display it, not even in the admin panel. In 1.2.1 the album name is displayed, but can not be viewed, even when logged in as admin, reason given: "You don't have permission to access /zenphoto/Charlevoix,Québec/ on this server.". I tried this with both UTF-8 and ISO8859-1 character codes in Firefox. As soon as I remove the offending character, e.g. change "Québec" to "Quebec", the album is displayed.
I also checked the UTF-8 box in the admin panel, it does not fix the problem.

Which "UTF-8" box did you check? There is UTF8 image URIs which might help.

The error message you are getting seems unusual. Normally we would expect a Not found type error if the character conversions between the WEB page and filesystem are not working correctly.

I checked the Options/Gallery Configuration/URL options UTF-8 image URI.

The permission message is in 1.2.1. The latest 1.2.3 version totally ignores the album, it does not see it, as if it was not there.

Looks like on your site you will have to avoid these accented characaters. They do work on most servers.

Oh, well...no accents. Thanks for testing it.

You of course should be able to use accents on the album title, just not on the actual folder name.

Oh, that's something I did not think of...so obvious, thanks again.