invalid channel assignment

[wayupnorth]

I can't create a segment when I process an entire project with D-noise 3.21 and Micro Editor 5.3. After computing the project I can play the noise-free version, but when I try to create the segment I get an error message saying the segment contains invalid channel assignments - whatever they are. I can't find anything in the documentation to explain this or to suggest if I'm doing something wrong. My projects and SF sound files are 16 bit 44.1k mono. The noise template is the same - except I had to make it a wave file for the Direct X plugin.
It works OK to process a single segment, but not an entire project containing multiple segments.