I'm bumping this old thread because I'm having the same issue, with the same mini display. My FM3 and FC6 just arrived today, and the top left mini display was blank from the first startup.
I went through this entire subform to see if this has happened to others and been resolved, which led me to this thread.
The FM3 arrived with FW 3,02 installed, the FC6 has 1.11.
The first thing I did, even though everything just came out of the box, was to do a full restore to default. No dice.
Next, I downloaded 4.0 beta 5 and installed it. No dice.
Re-installed 4.0 B5, and again nothing. Cycled through a few power ups just to be sure, and on one occasion I did get the blue box with three dashes in it, but it reverted right back to blank.
Downloaded 1.11 for the FC and reinstalled that. No dice.
Downloaded 4.0 B5 a second time and installed it, just in case the first D/L was wonky, but again nothing.
Tried implementing layout 2 instead of 1, nothing.
Downloaded and installed the OMG9 layout, still nothing.
The switch functions normally and the LED ring is lit, it's just that one mini display refuses to cooperate.
Any ideas that I have missed would be most appreciated at this point.