When I try to copy/paste text, it always comes up with that square with 4 characters inside of it.
Sometimes I don't want to launch something in a terminal (e.g. conky), and not being able to copy/paste into the alt+f2 dialog makes it difficult - especially if I have to type in a long file URI.
I used to use Gnome-Do and Synapse for this but am trying to give Unity a chance..