Yeah, starting from scratch worked. Deleting classes and BP’s in the editor must have left some broken links or something that were not easily identified in the UI or in any errors. It was worth the 90 minutes or so to fast forward through the lectures and do it all again. This was tedious, because it seemed that everything was identical to what I had, just this time it worked. The blend space editor in UE5 does user a green “x” instead of the green diamond as far as I can tell so that was irrelevant. Once I brought the BS_Locomotion into the ABP_ShooterCharacter event graph this time, I could tell immediately that it was working because it showed the little thumbnail version of the blend space. I was able to get it playing the idle/walk/jog cycles to match Sam’s lecture. So, I guess I’m sorted out on this.
I think the major takeaway is that the Editor does have some bugs, I expect some of this anyway, but when something just seems broken, it probably is and I should invest some time in setting up at least a local versioning system.
Thanks for your replies, I appreciate your help.