Hey, quick update... it's working again. (?)
Not sure if this is due to the recent update, or... I'm using this flight recorder called Flight Echo; it probably also connects to simconnect in order to record various states of the FenixSim add-ons. I usually start this before the sim (otherwise I forget), and naturally AutoFPS starts with FSUIPC automatically. I wonder if FlightEcho is somehow interfering.
Since I know it's working, I'll do some playing around in the next week.