Win10 64 bit; Third Gen i7 CPU; ATI HD7xxx GPU; 24 gigs RAM
Broken: Hash 89df672
Worked: Hash f70b548 (May16)
Short description of error
When the scene contains enough hair and the object it attaches to contains an SSS material, the Spatial Splits BVH build phase will suddenly stop and stay that way until Esc is pressed. This is only a Spatial Splits problem as turning off that checkbox allows the render to go like it should (it looks like a recent commit may be causing the build to lock up at a certain point).
Exact steps for others to reproduce the error
Open the .blend file and try to render the scene