I was in the MP Menu, chatting. Got a pm from KoboldButter. Switched to the PM tab to read it. tried to switch back to world chat... and found I was stuck on the Friend Tab. While stuck in the friend tab I was able to click on friend's names and message them (though I could not click on the chat window that the message opened). I attempted to search for KoboldButter's name and reply to his message, but he was unsearchable (though he was online). I didn't try searching for other non-friends, but am thinking it would not have worked for them, either. I could not access any menus or click anywhere on the screen other than the friend tab (which I could not close).
Wouldn't be the first time I broke something. Be my friend. I really do insist. Touch, but don't look. I like doing things opposite to the norm :X You didn't check the Gnome Warrens, huh? Yeah, it's filthy down there, I don't blame you. They were probably Gnomes, anyway. I really do insist.
I see you managed to avoid apologizing for breaking the game, or not being my friend... and bad mouth the kindly gnomes. You are a slippery one, Mr Butter. Would flame you, but am afraid you might have a melt-down, Mr Butter.
Keep your friends close, and your enemies closer. Trapping both in your Friend Tab may seem effective, but is gauche and lacks finesse.