Question: I have a Cannon MP560 that kept having communications errors. One of the suggestions I read was to remove the printer from the print & scan menu and re-add it. Once I did that the scanner disappeared as well and I cannot get OSX 10.7 to recognize this device as a scanner again. 

* Does anybody know how I can get OSX to recognize this device as a scanner again?

Here are some screenshots of my print & scan screen and my add printer dialogue. Bonjour does not show me any information about this device either. 

![enter image description here](https://i.stack.imgur.com/fX8Ad.png)

![enter image description here](https://i.stack.imgur.com/Jgfpy.png)

Answer: 
Have you tried deleting the .plists associated with the printer? These are all in my `~/Library/Preferences` list. I would move them to the desktop (just in case you want to move them back), restart your Mac, and try adding the printer again.
After updating my Mac to Yosemite, my Canon MX350 wouldn't scan. 
Type in
www.usa.canon.com/cusa/support/consumer
You'll be on Get Product Support. 
Type in your model (eg. PIXMA MX350) click Go. 
You should see Operating System Yosemite (detected). 
Look for the series Scanner Driver Ver. and click Select. 
Then you'll see Download and click that and go through the download "motions.
Restart the computer and your scanner should be working great. I just clicked on the icon MP Navigator EX in my dock and viola, it was all there.
This is how I fixed mine after spending hours watching videos and reading so many suggestions. I just did this and actually figured it out myself.
Hope this can help others!!
Cheers!