Unity 5.2: Mecanim Transition Blending

I recently updated to 5.2 and noticed that the animations I have applied to generic avatar based rigs is not blending properly with mecanim anymore. I have done some tests and attempted to look for solutions to no avail.

I have linked to a video illustraiting the issue:

Youtube Video

With my tests, it seems to be related to rotations only, and I think it might be something to do with large changes in the degrees of rotations, almost like it is not working off a quaternion rotation system. Any idea what might be going on?

+1 for support