Same thing here. The first insertion was OK. At my first refilling, I had to fill, start, stop and reinsert the cartridges. Now, from time to time, the printer is showing that a cartridge is empty and actually is not. This is normal I think. AllI do is take off the offending cartridge, reinsert it and away we go. BTW at the same time I check all the levels and refill the cartridges.