I've had this happen a couple of times today while working on building a simple hazer profile.
When I selected a fixture to copy, or when I hit the Build fixture button I would hear the hard drive write for a second and then both screens went to the blue iPC logo. Only solution was to restart the console.
Seems similar to this thread... forums.highend.com/showthread.php?t=11842 but this is on new 3.20 software.
Console is an iPC with V7M8X VM400 mother board, running v3.2.0
Show was just merged from and older show
No other devices running at the time, just an external keyboard.
Mike