I've got a pretty interesting issue here. As the title says, the 3.5.1 upgrade (from 3.4) causes a TypeError in jquery.js, but only below window sizes of 768px wide.
Uncaught TypeError: Object #<Object> has no method 'none'
It's on a live site at the moment, so feel free to dig around in the developer tools. The site is http://www.cushionid.com.au.
Thanks in advance for your help.