Hi Bill,
Fair play... it was very annoying.
Came at a price though. Previously, when you sorted your messages by "new" or "read" if a message went to "read" status it would be auto sorted into the "read" pile.
We couldn't keep that and have the arrow keys work the way we want.
Not a great loss. I judged that between the two it was the lesser of two evils.
Cheers,
Wilson.