Nothing at all. Rapping with a plastic handled screwdriver had no results. Still stuck in the middle position.
The breaker was working perfectly minutes before. Are you thinking that the breaker failed during the short time I was working on replacing the new fixture?
I replaced it and now all is well. I took the old one and whacked it harder, forcing the switch back. Now, it works just fine. There you have it. Thanks for the hel[.