The program works fine until I try to use a theme other than the default or testing. I get this error:

"Fatal error: Call to undefined function: printadmintoolbox() in /hermes/web09/b2099/pow.midorianne/album/htdocs/themes/killer_bee/index.php on line 12"

Any help would be great, thank you.

What version of zenphoto are you running? The testing theme was removed a few releases ago.

According to my host it is - v.1.0.2b

That is a really old version of zenphoto. It does not have the function printalbumtoolbox() which is why you get the error. You need to upgrade to version 1.1.4