*snicker*
The profile's are, well, a set of permissions rules that are fairly fine-grained. In theory they might allow us to have a gallery where members could submit art, but only a small handful of people could view the art...a handy way to hold a contest, for example. Unfortunately most people don't realize what in the world the profile's are all about, so they occasionally create their own, or choose something other than Default that sounds good, and end up clobbering people's ability to see their art or comment on it. And the annoying thing is, there's a bug in the software that won't let me delete profiles!
That said, I"m not using the latest-and-greatest version of the gallery mod, so I'm hoping that bug will be fixed in the new version of the site based on the latest revision.