Ok here's one - When you have some one at your house (or guild house) and want to invite them to the other, you first have to kick them out of one place and then invite them to the other. This isn't so bad, but what makes it frustrating is that if you open their profile from the friend list, kick them out (which brings you back to the main profile page with their walking character), and then go to 'more options' you have no option but 'kick them out' again (no invite to gh/house)... maybe that was convoluted, but what seems to be wrong is something with the flow of the menu when it comes to navigating house/guildhouse invites.
What I would *Like* to see is being able to have the button there to kick from house in addition to the button to invite them to the other house/guild house.
If it would help, I have experience in drawing up menu flow diagrams from a position I held as a project manager in a games-software development company and would be happy to do one up