Thanks for the feed back. Also, I have never clicked on a model from so many angles, so many times.
Tried all of these suggestions. Furious clicking the front orthographic view will sometimes catch the 2 problem bones (head & neck). Of course, in practice that meant selecting then immediately deselecting the target bone. Same view, alt-Lc worked, but with inconsistent results. Again, it’s an oddly specific and new issue to me.
Ultimately, searching in the Outliner was reliable, if inefficient. After a single key was set, the bone was selectable in the graph editor for additional edits. That said, Wayne’s screen named the bone he was working on. Without the bone’s names on screen, that wouldn’t have been a workable solution.
On the plus side, the course was repeatedly playing on a second screen while working through the issue. At this point, I’ve heard the dialogue so many times I can recite long stretches from memory.
Good course. Completed 1.5 times (the first pass was trashed, trying a reloaded file as a solution). Mr. Dixon wants reps, so I’ll redo it again tomorrow.