I HAD the same problem. I needed to open the boards.txt and find the board I needed, count down from the last visible board in the IDE menu, then use the down arrow key to select it. You know you got it right when it shows up in the bottom right corner as being the one you are programming. I say HAD because when I posted the problem here ---> http://arduino.cc/forum/index.php/topic,154800.0.html
, eried sent me a message pointing me here ---> http://arduino.cc/forum/index.php/topic,118440.0.html
Hope this helps, and I hope the "Arduino Team" adds a patch in the next iteration.