Hey all, my wife and I occasionally have this same issue with our Z10s. When in the BBM or text messaging app there is no way to get back to the hub or inbox list. You can swipe up to close the app but as soon as you go back to messages your stuck in BBM or text again, where ever you left off. Eventually enough messing around seems to resolve the problem, needless to say it's annoying. Are we alone in this?