Cathy suggested I contact you. I am running a Mac X v. 10.8.5 and have an Epson Stylus Pro 7600 driver ver. 9.17.
I filled my new carts with Piezo Neutral inks. I performed an Epson changeover from photo black to matte black with the black draining cart. I installed the newly filled carts in the printer and closed the ink lever. An error message appeared in the 7600 LED window: “Release ink lever, wrong cartridge,” along with a blinking ink-out light for #1 black. When I release the ink lever, the message “Replace with new cartridge” appears. When I update the “Epson Printer Utility 4” on my Mac, the message “Ink out or incompatible cartridges for the following colors: photo black” appears. I have 1) removed and replaced the black cart 2) removed and replaced all carts 3) jiggled all the carts 4) restarted the computer and the printer 5) pressed the carts to the left and to the right on insertion 6) removed and replaced the printer list on my Mac (and gone a little nuts in the process).
It seems that the printer-driver does not recognize that the matte ink has been installed. I have attempted to find a way to check that, but am stumped. I hope you can see the error of my ways. Please advise. Thank you! TomL