Something else I have noticed is any of the shaders effected by this have had the highlight set back to color. Changing it to a % is one of the first things I do.

But so far I have found no rym nor reason to it.  I opened a scene and this had only effected one object in it and it was one that isn't regular content, and I had retextured. So basically it's a crap shoot when I open a scene if or what may be effected.