Bug: Shortcut for scrolling between notes of a chord
1) Write any chord in which some (or all) of the notes are tied to notes of another beat.
2) Select (either with the mouse or after scrolling with a keyboard shortcut) one of these tied notes and change its pitch with the up or down arrow.
Then the keyboard shortcut for scrolling vertically between the notes of the chord stops working.
What's worse, there doesn't even have to be a chord involved, this also happens if you have a single melody line in the treble staff and another in the bass staff, and you want to scroll from one to the other after having re-pitched any tied note.