I just upgraded my main computer to 12.04 (32-bit) and Gnome 3.4.2 (I hate Unity with a vengeance!)
Everything works as expected except: if you minimize your "New QSO" window it just wont stay up again - it briefly opens the window, and the minimizes by itself again.
 
I have not seen this behaviour with any other applications.
 
73 de OZ1PIF/5Q2M Peter