Well, with this URL I figured it out, sort of.
Miss Enchantress is being redirected to cat=4 forums in this case; cat=4 forums are a set that she does not have access to so none are displayed (they are displayed to me, which is how I figured it out).
In the first case, she was directed to cat=1 forums, the News and Announcement forums, which she of course can see.
Under normal circumstances she ought to be redirected to cat=0 which would be all forums, displaying only those she has access to.
As for why she was directed to only one set of forums instead of the whole lot, I can only speculate that it is a very tiny coding error somewhere. I've never experienced it though, so it could also be something else (maybe a browser issue?). This is all I'm capable of figuring out on my own, if it really is any kind of coding error it would be in the hands of Magister Ventrue to do anything else, if anything else need be done.
"The devil I'll bring you," answered Hagen. "I have enough to carry with my shield and breastplate; my helm is bright, the sword is in my hand, therefore I bring you naught."