As a shipyard completed a new batch of ships I got an "Error in Production | Error 6 was generated by Aurora | Overflow" and I realised all ships were built without fuel stored. Now each ship I build on this planet does the same and any ship I order to refuel at the colony refuses to do so, just orbiting the planet.
I have 2,295,093,420 litres of fuel stored on the planet (yes, it's been a long and fun game =) ) which makes me assume there's too much fuel and that produces the error. However, it still displays correctly within the summary tab and with real numbers the amount shouldn't cause any problems yet ... ? Only the longint with a max of 2^31 limits at 2,147m?
Manualy transfering fuel to each ship through its miscallenous tab works and refules them, yet proofs very teadious.