BBM update slides into Beta zone which may(or not) appear officially on App World if everything works out perfectly. Luckily, RIM did release change-log:
In this latest upgrade, we’ve focused on bug fixes in platform such as avatar changes in Bridge and enabled a ‘Third Party Application’ discovery system message.
Issues: When scrolling up to view message history in group chat focus jumps down and makes it hard to scroll
Download app from BlackBerry Beta Zone >>
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