I seem to be running in to a bug with the Candle engine now. It used to generate electricity on its own, and now no longer does. I have tried quick save/quick load with no result, as well as closing the game and re-opening it. Am I missing something? Sorry if I missed something in the notes; I did look, but did not see anything about the Candle.
Edit: It seems that the engine has stopped producing megajoules. It has lots of thermal power, I don't know what would cause this. It most likely happened after docking the probe with a station.
Edit 2: Second probe, all worked perfectly until I docked, then MJ production stopped again.