Alright - I think I have a functional install. I can log in and get to the admin area, BUT, when I ran the setup page there was a pretty long list of errors. If it's OK I'll just post some of them here:
"Warning!
You should consider disabling magic_quotes_gpc. For more information click here."
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"Warning!
Setting mbstring.internal_encoding to UTF-8 in your php.ini file is recommended to insure accented and multi-byte characters function properly."
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"Warning!
When this option is not in effect, file and folder permissions are relaxed. This could constitute a security risk so it is recommended that you enable Strict Permissions. However, on some servers Zenphoto does not function correctly with strict file/folder permissions. If you enable this option and Zenphoto has permission errors, run setup again and disable the option.
Click here to use strict file/folder permissions.
NOTE: This option applies only to new files and folders created by Zenphoto. You may have to change permissions on existing ones to resolve problems."
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And perhaps the most troubling was a VERY large table of files that are either missing or their filetimes, whatever that means, are out of variance.
So - have I messed up the installation somehow?