System Information
Windows 10 with 2x Nvidia GTX 970
Blender Version
Broken: 2.78 RC
Worked: 2.77
Short description of error
Open file with one bone already selected in Pose Mode. Try select bone another bone = Black screen
Exact steps for others to reproduce the error
The (already) selected bone can be manipulated when the file is opened. The next selection seems to cause the freeze
