Why After Effects 2015 automatically switches mode to wireframe?

When I drag the layer I can not see composition in 2015. All covered with silly lines, nothing is visible underneath.
Viewport Mode: Off (Final Quality) + Live Update On
This problem was not in CC 2014.

Example http://i.imgur.com/tQbE0kd.gif

This is very annoying and distracting. So many unnecessary details appear on the screen at once.