I've got an OKI C3100 colour laser printer and have configured Mint's printer settings to show 2 instances of the printer, one as regular colour and one as mono (black and white) - mono as default printer. (This works fine with Windows XP)
When I try to print any PDF file using the default Mint viewer it will only print in black and white when I manually select the colour printer. (Using Mint 8 )
All other applications such as printing an OpenOffice document, a page from Firefox or even an email from Thunderbird with colour content print OK in colour.
I've tried changing the default printer to the colour configuration but that still does not work.