Not yet, I'm afraid. I just purchased another ink cartridge that was running out.. the LLK, which is one of the colours with a total clog (or air trap - but still not printing anything). I did another ink charge and still nothing in either the LLK or Y. At this point I'm at a loss. I haven't called ProGraphics yet, but I'm thinking it's going to be a damper replacement or worse, and I just can't afford it right now. The problem of course, is that the longer I leave it, the more problems I may have, but if I have a service call, I guess whether it's two nozzles or all of them doesn't really matter in the case of a new head. So, for now, I'm going to run with my 9900 doing double duty and when I can afford it, I'll get a service call on the 4900.