After composing and “sending” a new e-mail it shows as “read” in the outbox and won’t go out until status is changed to “unread”. This seems to be a new “feature”.
We mark the messages in Outbox as unread only if sending them fails for some reason. Please check if there are any errors reported under Tools -> Operations.
I did a little more testing which confirms your response. I don’t remember just what circumstances led me to believe something was wrong. Sorry about that