I’m working on a scene where all of the sudden, the DR nodes seem to be ignoring fresnel reflections or something to that effect. Lower right on image is how the concrete floor should look. My workstation is working perfectly, but the nodes are not. Recently “upgraded” to 2017 and 3.50.04. Not sure if that’s a factor, but N. Korea is also a suspect at this point.
Did you update all of the nodes with that same version? Do you get any errors in the log files?