Ok this happened with my facebook application. What you have to do is go to options>Advanced Options> Applications then curse to Blackberry maps and hit the menu key and delete it. Next load your Blackberry up to your PC and load up desktop manager. Then backup your existing apps, contacts ect. and download the 4.5 OS from either here or your carier if they support it. Next re-install the OS and voila it should all be there. If not there is a download link from RIM for blackberry maps and you can do a OTA installation.
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