Canon MX860 "offline" when trying to print over wifi
I've been printing over wifi with no problems to my Canon MX860 for months. Now, as of the last week or so, it just... won't work. I've tried reinstalling the drivers and setting everything up from scratch, I've tried every bit of advice I can find online, and... nothing. The printer setup will seem to go OK, the Canon LJ utility tells me there is a good connection between the printer and my Airport Express base station, but when I actually try to print, I get the bouncing printer icon in the dock with a red exclamation point, and it turns out that the printer is allegedly "offline".
I have tried everything I can think of, over and over and over again, and am getting incredibly frustrated with this. I have no idea what has happened to stop my printer working (or rather, to stop me being able to print to it - it works just fine if I want to use the USB cable, which I don't) or what I'm doing wrong, but it is driving me nuts. So... any advice MUCH appreciated!
Mac OS X (10.5.8)