I have had this Airport printing problem forever - one of my three macs refuses to print wirelessly. I have a Mac Pro tower, a 17" MacBook Pro, and a 15" MacBook Pro. Only the 17" will not print over the Airport Extreme, but will print when connected over USB. I've done printing system resets, driver installs, etc., but no luck. I see the print job go to the printer and the printing monitor app opens in the dock. I see the job in the list and it does say it is...