Been using my ip4300 happily for years. It's linked via USB to my Mac mini running OSX 10.8.4.
Suddenly, my grayscale setting, which I use to print occasional emails, text docs, etc, still prints the majority of text in black, but some heads etc are in a muted green colour.
For example, just printed an email, where the "To" and "ReplyTo" headers are in this green, as well as the head date.
Any idea how to get me back to all-black again?