I, too, am using Site Builder as an important part of the design and layout, just FYI. I’ve tried installing responsive menu plugins to no avail. Nothing has worked.
Has anyone received resolution on this? I am having the same problem. http://www.betawillpowellfitness.com. The desktop menu works great; the tablet and mobile menu buttons aren’t clickable. I’m hoping this is an easy fix; like another user said, more than half of all of my website traffic is mobile/tablet, and we are losing a lot of business because of this bug. HELP!