ah, I just discovered the problem with the material naming thing. the name-input-line keeps the focus, even if you hit enter. the only way to get the focus out of it is to either change a setting of the material, choose another tool (doesn't work, if you use shortcuts of course) or click somewhere in the stage (a bit uncomfortable, because quite often at this moment the paint bucket tool is selected and you don't want to paint anything).
the best way would be to type in the name and then hit enter to confirm and draw the focus away of the name! (any Googlers listening? write it down somewhere, cause unless you change it right now this is something you easily forget π )