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Sounds like the printer may not be recognising the CISS chips properly. I’d power it off, reseat the cartridges/chip contacts and check the ribbon isn’t stopping the carriage moving freely. If both ink and paper lights are flashing together it can also indicate a general error, so I’d sort that...

Yeah, I’ve read about this before. From what I understand, the tracking dots are mainly associated with certain colour laser printers rather than inkjets. I’d be pretty surprised if an ET-8550 was doing anything similar, but checking a few solid colour prints under UV could be an interesting...