I am asking this question for a good friend who knows little about computers etc.
He has a Canon Pixma MP560 printer.
"Recently, whenever I try and print on gloss or matte paper (I alter the paper type in the Properties as usual), it prints images fine, but any black text or borders, comes out blue. I don't think this is a matter of clogged print heads. If I put gloss or matte paper in the printer and tell it to print on plain paper, it prints OK. Just wondering why it prints blue when I specify the paper I am using as either gloss or matte."
Between us we have established that the cartridges are full and all cleaning operations have been done.