After posting that last post about a successful upgrade I figured out that for some reason I couldn't log out. So instead of trying to find a fix for it I foolishly killed all the cookies (forcing a logout).
Then I discovered I CAN'T LOG IN EITHER!!!!!!!
So I spent the better part of yesterday trying to fix the problem. As a result the photo album is stuffed - but I'm getting closer to allowing comments on specific photos.
The problem, it turns out, is not with WP but with using IIS as the server. There is a full explanation of how to I went about fixing the problem here.