Ive been using this printer mainly in grayscale mode and had recharged the big pgbk cartridge several times before with ink from inktec and everything worked normally after that . This time I was printing and at some point white lines started to appear in the prints, so I decided to refill the cartridge. After the refill it printed even worse with white lines and in sectors missing a bigger part inside them, as if it ran out of ink. Executed cleaning, deep cleaning of nozzels. Then when it prints a pgbk pattern a bigger part of it is missing. What happened and how can I fix that? If it is because of clogged nozzles then why earlier that day it printed normally? Additional question: does it use only PGBK catridge in grayscale mode?