Windows 7 64bit
Blender 2.78 (26.09.2016) 4bb1e22
Program freezing in pose mode when try to set ghosting. Ghosting type must be 'Around frame'. Problem appear when 'Step' is 0 and as first I try to change 'Range'.
Download and open file
On right side go to Armature properties
Go to 'Ghost' and write number in Range-field (keep 0 in Step-field!)
Press Enter - Blender will freeze