I'm still finding that the LED flashes for a few minutes after reading the last new message, pretty annoying. They have updated the message they give you when opening a conversation - it now says 'one unread message' instead of 'older messages'.
The LED continually flashing should be sorted by now tho!
After the update sometimes even if i get a message i dont get notified. I hear the sound but there is no icon in the notification bar! (9900, 7.1.0.342)