I was just messing around and exploring all new stuff a bit when I ran into this glitch:
I went to Realm Information and then Guilds. Works fine.
Now I noticed the "Realm" menu, and was surprised to see a few other realms (but certainly not all). So I selected another realm, which gives an error because there are no guilds for it in our roster. Obvious.
However, from there I can't select my realm anymore, trying to do so gives this error.
Bug, or am I doing something stupid?