DeletedUser370 Nice! Clearing the cache did nothing but clearing user data made mark as read work again. However I've noticed another strange behavior. While testing I sent messages to myself via XMPP. I did not receive these messages until I opened the Messaging app. I'm not sure if this has anything to do with the way these SMS were sent or is the app acting up again. I'll have to check by sending from another phone. Anyway, thanks for the help with this.