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Ok, so...couldn't stop thinking about this. After detailed examination of the walls and windows...nothing. Then I started looking at the Space polygons. The two spaces in question were a mess. Plotting the coordinates in Excel revealed that the spaces each had numerous duplicate vertices as well as vertices which were in the center of the space. (making a backup copy) and removing these 'problem' vertices fixed the problem. WOO

Moral here is that the error was not due to the wall/window, but due to the space polygon. Reviewing the OSM file from which the CBECCcom file was makes it appear as though the error occurred in translation. Keeping in mind, this was a running and compliant model, even with the error(s). We'll run again tonight and see how compliance goes.....