LUT Editor Window Blank [SOLVED]

Unity 4.6x
When opening the AC (1.1.1r1) LUT Editor window, it comes up blank.
I cannot close it either, I have to put it in the background to hide it.
When opening the AC (1.1.1r1) LUT Editor window, it comes up blank.
I cannot close it either, I have to put it in the background to hide it.