Tip No 67 - Canon PG-40 CL-41, PG-50, CL-51 woes

Users of the above mentioned cartridges, please don't swap your cartridge into another printer when the ink counter is still working. The programming of the printers using these cartridges is so aggressive that once a cartridge is installed into a printer that cartridge will not have ink levels recognized in any other printer. Any other printer using that cartridge will see the cartridge as a "used" cartridge. More info available here