Update since moving to 5.0.16B:
The communication between ISY and Schlage BE569 seems to be working better. However, the Admin Console Device UI was not showing current status (lock was LOCKED, status was UNLOCKED User 1 from when I arrived home an hour previously). I used the Query button (more than once) which caused communication with the lock, but did not update UI. I then clicked on Options, and after two tries (System Busy message box - no content, just header), the UI updated, and the Options panel opened.
Event viewer snip: