Shift+Alt+B on MacBook

Regarding note entry, everything works fine except Shift+Alt+B (to enter a B an octave up from the closest.)

Shift+Alt works with every other pitch, but not B. I haven’t changed key setting defaults, and it doesn’t do anything else - it just does nothing.

Ideas? I’m on a Mid-2014 MacBook Pro with the MacOS 10.12.3 and Dorico 1.0.20

See this thread