With a empty album folder I get this log-file:
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )
Array albums( 0 => , 1 => )

The Adminpage told me this:
Gallery Stats

* 0 images
* 2 albums
* 0 comments

But the Album dir is empty.....

When I go to my zenphoto side I get this message:

Warning: require_once(/www/html/zenphoto/themes/) [function.require-once]: failed to open stream: Invalid argument in /www/html/zenphoto/zp-core/functions.php on line 1432

Fatal error: require_once() [function.require]: Failed opening required '/www/html/zenphoto/themes/' (include_path='.:/opt/php5//lib/php') in /www/html/zenphoto/zp-core/functions.php on line 1432

Only the adminpage works.

Hello Sbillard,

thanks for all your help. If I give you a ftp-account to my webspace and a account to the mysql-database is this helpful to find the bug?

Can you look at the above file in an editor which will show you non-displaying characters? If we take the output literally, there are two "folders" in your albums directory with an empty string as the filename. That is unlikely both from an operating system standpoint.

I could possibly debug this with access to your site as you describe. Send email to stephen (at) sbillard (dot) org.

He Guys I'm having the very same issue. Did you 2 found a workaround eventually?

There is a fix for Nopes problem included in the nightly builds. So if that it the problem you have, install the nightly.

what is the "the nightly"

http://www.zenphoto.org/files/nightly/

Here is an explanation: http://www.zenphoto.org/2008/08/zenphoto-glossary/