OS X 10.10.5, 32gb Ram, 6core intel Xeon - mid 2010.
daily build blender-2.78.0-git20170603.420d4a70b8-x86_64
Short description of error
Denoising not working when render performance "progressive refine" is enabled. When progressive refine is disabled denoising works as expected
Exact steps for others to reproduce the error