Scanner sharing has stopped working! The only thing that changed was an OS X update. The scanner is an MP480 multi-function printer connected to a Mac Mini. Normally, we can scan from our laptops without using scanner sharing without unhooking it and plugging it in directly. Has anyone else encountered a similar problem after the most recent OS X update to Mountain Lion? Also, do the drivers and software need to be present on each machine, or only the one it is connected to?