Win64 bit, i7 3770 processor, 24 gigs RAM, AMD 7700 GPU
Broken: hash 9f8bb58 (October 2)
Worked: hash 83ce028 (October 7)
Short description of error
I'll let the image describe it
The variance denoise passes are broken, they are no longer calculating the actual variance (so now it's just like the regular versions of the pass with different color values).
Exact steps for others to reproduce the error
Render the scene in an older build, check the pass info. Render the scene in a newer build, check the pass info.