Force "B" above the default position

[Mark_Johnson]

It’s a known bug in the Mac version.

option+shift B does not write B in the octave above

The problem with Shift+Alt+B is a bug in the underlying Qt framework that we have reported to their developers, but which has not yet been fixed. It should be possible to assign a command to this combination, but it is not at present because Qt considers it an ambiguous combination.

See also this thread from last year for more discussion.