My bad; I should have mentioned that I've watched that video 5x, and I've also looked over this site for hints.If you haven't seen this video tutorial then you should check it out.
Interesting; maybe I'll try to mask the area of the watermark. (I haven't bought BI yet because I've not gotten any response about how the v5 licensing / support actually works.)
I unchecked the "Enable AI Detection for this camera" box for the default camera; but now I get NO detection at all, even though it's checked in my SD camera that I added. (Should I have added the SD or the HD camera?)