At 0.50-0.55 you say press alt-a but for the keybind seems to be shift-a. Just heads up.
Ops, sorry about that. Thanks for making a note of it.
Glad I looked at this question. I couldn't figure out why my bone wasn't adding.
Actually, shift a isn't working for me either.
Same trouble!
Thanks for the leg work!! (Pardon the pun) :)