Sorry to whine on my first post here.
I AM NOT using the recycle / returnable Lexmark Cartridges
I purchased a refill kit and re-filled the (just about empty) black cartridge (#44XL) - no problem.
The vendor instruction say just fill the cartridge(s) and continue to print (even though the Lexmark Software says it is empty) - wrong!
The printer software thinks the black cartridge is empty now and will not print from that cartridge. It tells me that it is referring to the color cartridge (factory near-full 43XL color cartridge). Black printing comes out in gray - since it will not use the black cartridge anymore.
I'm thinking you can refill these cartridges - but cannot really use them.