The mission is "Turn off the light" which is provided when you have the F-16C module and the persian gulf map.
I tried mdmasters trick and it works : "I toggle the GPS time field to "off", then suddenly the data link starts working, the sync field says "syncing" (or something like that) for a moment, and then it changes to a status of "fine". I can then turn the GPS time field back to "on" and the data link seems to work."
