**System Information**
Windows and Mac
**Blender Version**
2.74 RC2
I'm using a PC2 mesh cache from Maya. The mesh itself will not motion blur, but the hair system that's attached to the deforming verticies DOES motion blur.
Here is a link to my test scene:
https://drive.google.com/open?id=0B7lyy4TY_vd_UzN5MmJTSzBhakk&authuser=0