I was flying a JetBlue Airbus A320 IFR from Hollywood to Kennedy with a planned cruising altitude of FL370, when I noticed that my fuel flow was dropping and I was losing speed despite N1 being at or above 87% on autothrottle, and fuel itself being sufficient for the flight plus extra, holding, diversion, and taxi.  And, of course, Radar Contact decided to crap out just when I tried to declare an emergency.

I tried disengaging autothrottle and manually moving the thrust levers, but that didn't work.  I tried turning on the fuel pumps in the overhead panel, but those buttons are disabled for the A320 model.  My only option would have been to shut down my engines, which I did not want to do without Radar Contact guiding me back down to Earth.

Keep in mind, now, that this is the A320 pack from the Simviation Download Center.  The flight was conducted with real world weather and failures supposedly disabled.  Why did this happen to my aircraft?  Did my fuel somehow freeze?  (Because if the program could simulate that, that's both cool and frustrating at the same time. )