I have Ubuntu 14.04.1 LTS. When I run the application "Simple Scan", it does not recognize my scanner, but when I installed the printer, it got recognized. I can also print without any problems. There was no issue like this when I used Fedora 20 with Gnome Shell 3.10.
Thank you for your help!
(Info: Translated from Spanish - Original message is found in the revisions)