I acquired a Canon i850 printer about a month ago which I am running with Mac OS 10.2. Although I have used it extensively, the ink level in all the cartridges still appears as full when I open up the utility which displays this information. I wonder if I have either a software or hardware problem? Perhaps the level will appear to drop sharply at some point - like my car's gas gauge - or is something wrong? Can someone with experience with this printer/driver advise me?