I think Kirk and Dan hit the nail here. Make sure you have the latest version firmware in all of your equipment (And Database if you want to team fly).. I once dug up an old thumb drive to download a flight at a contest and the next day nothing worked. Turns out there was an old generic config file on the drive I randomly picked out of my flight kit. I was using the PF for my primary logger at the time so it was a scramble to figure out what happened and fix it on the grid.