I experience the same issue: Password-protected galleries don't seem to work properly. The error messages "No category specified. If you followds a valid link, please notify the administrator" keeps coming up after submitting the password. Setting up the gallery in Admin CP is no problem, though. Just when trying to access it. Anyone have an idea what the problem could be?
http://www.mopane-tree.com
W i n d o w O n S o u t h e r n A f r i c a