Navigation problem in Mail

Since upgrading mail files to a template based on the 6.51 iNotes mail template we have an odd behavior. When closing a message the display and currently selected message often switches to the very top of the folder being viewed (Inbox, Sent, etc.) where before it would stay on the just-viewed message or, if that message were deleted, move on to the next message in the folder view.

Known bug? Setting that needs changing?

David