I would have a guess that the flycam has fallen victim to the very low voltage that Futaba is now putting out on the data signal pin. There have been other devices which have not worked with the modern Futaba receivers because of this. The devices read the voltage as permanently low signal or as non-existent, so they don't see the PPM wave form to respond to. Ideally Flycam should modify their design to work with Futaba's low voltage, but failing that a signal booster between the Rx and the Flycam will probably fix it.

Harry