The error logs I am referring to are the CGI logs where PHP will place its error messages. Not the Zenphoto logs. Anyway, if you have not done so, please give the nightly build a try. As I mentioned, that is the version of software I was using. I do not know why it would make a difference, but it might.
I doubt that I could tell anything from actually loggin into your site. You have posted your menu, which seems correct and works for me. If there are no CGI errors, then try as kagutsuchi suggests and make one menu item at a time and see what works, when it fails.
Also, of course, check to make sure that some kind of server/browser caching is not "fooling" with you.