Have had great experience with your system - until now - on my Epson R3000.
Simultaneously, both these carts (PK & Y) indicated empty or almost empty. When I went to refill, both had (1/3 Photo Black) (and 1/2 Yellow) ink left. I topped them off, reinstalled, and the indicators did not change. I removed all carts, powered down for 10 minutes, powered up again, reinstalled carts, no change. These are the non-battery chips.
Because the PK indicated empty, the printer would not let me switch to glossy paper at all. I was able to print from the yellow with the MK cart selected. The yellow soon "ran out" even though it is full. The printer would not let me proceed without replacing the yellow cart. The IJM yellow cart still shows up as empty even after taking it out and replacing it.
I'm in a holiday crunch, so I went and bought Epson replacement carts, and they work fine, so the printer is able to see a good cart in these slots.
Please let me know if there's more I can do to get these going again. Also with the Epson replacements in service, are the IJM carts at risk while out of the printer?
Does this mean that my other carts are going to die soon?