Please state the exact version number of Lightroom (go to the menu item Help->About Adobe Photoshop Lightroom...)
Please state the exact name and version number of your operating system.
Lightroom version: CC 2015.3 [ 1052427 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.11 
Application architecture: x64
Try turning off the graphics acceleration.
Go to Preferences, click on the Performance Tab, then uncheck the box
I just checked and it says that the graphics accelerator was disabled due to errors.