The page is http://www.marbleheadmemorials.com/gallery/
It yields nothing helpful in either the error log for Zenphoto (nothing at all is logged), the user account (nothing at all is logged) or the server (again, nothing logged). Further, the error itself is very unhelpful, but is the same on the front end and Admin end.
If works perfectly fine if I go back to Dso PHP handler, but like I said, that's not possible. So I need to understand why it won't work with suPHP as the processor, so I can either fix it or more the client's gallery to something else entirely.