UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2886.0 Safari/537.36

Steps to reproduce the problem:
1. Use element selector to select an element in the page
2. Try to select elements above the selected element

What is the expected behavior?
Elements should be selectable

What went wrong?
Selecting elements does not always go right

Did this work before? Yes 

Chrome version: 56.0.2886.0  Channel: canary
OS Version: OS X 10.12.0
Flash Version: Shockwave Flash 23.0 r0