Hi,
I just noticed that if I have “Load Cursor with Item” enabled in General Preferences, I am not able to click in an Arpeggiation for a chord that is not a whole note. (Whole note works, not half or quarter notes or seemingly notes with a stem). The only solution for me was to change to “Create item at selection” for this operation. Not complaining here, just letting the developers and others know about the issue.