I don't think you'll find anywhere in any of my posts where I assume it's a bug.
Not directly, no. But you did say:
I'm starting to think that Sonar doesn't produce viable .wavs
That sure sounds like the presumption of a bug. Any DAW that cannot produce viable output clearly has a serious showstopper of a bug. That's what elicited the "it's not a bug" responses, and why I replied as I did, for fear that you'd waste energy barking up the wrong tree.
I can't imagine why you concluded that "it's really not worth pursuing further", without describing a workaround. If it was me, I'd want to know why the problem was occurring so as to avoid it in the future.