After I upgraded to Leopard I noticed after printing, the printer icon remained in my dock and I'd have to manuall quit. I googled the problem and learned about right clicking and choosing "auto quit" to make it go away after the print job is done, just like in Tiger. It worked just as it was supposed to. But a week or so ago it stopped auto quitting, even though auto quit is still checked. I tried unchecking and rechecked and it still doesn't auto quit. I just updated to 10.5.5 today but it started happening on 10.5.4 so I don't think it's a problem with that. Any ideas? Is there some sort of printer plist file I can trash?