Thanks Solver - yep, you figured it out... although at first I wasn't quite understanding what you meant and I was sure I hadn't replaced my main layer with siding... so I popped into my Wall definition to take a screenshot for the thread and then I saw what you were talking about. You didn't mean that I had *replaced* my main layer with siding... right there on my siding layer, I had checked the box for "Framing".... so I will uncheck that now.
Posting a screenshot for anyone else who might be struggling with this.
Which leads me to trying to understand this further. I also had the "Framing" checkbox checked on my main layer for Fir Framing. I am curious why they would allow you to check it on two layers - or why you would want your siding layer to have the option to be framing?
Thanks for figuring it out!!