using arrow keys: can't shift note pitch up/down after changing note duration

Using Musescore 1.2 Revision 5470 on MAC OSX 10.8.5

Repro steps:
1) Select a note placed on the staff, ensure keyboard up/down arrows are able to shift the note's pitch up/down
2) change the duration of the note by hitting one of the numeric keys 1 through 6. (say to change the selected quarter note into an eighth note)
3) try to move the already selected note up/down. It is stuck.

Workaround:
When the note is in the "stuck" state, use a sideways arrow to select either the note before or after. Then go back to the "stuck" note, and you'll now be able to shift the pitch up/down.