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I'm using Davis 9220/18.104.22.1686. I was trying to upgrade my facebook app to version 4. I delete the previous version. And after restarting my blackberry, I couldn't find the FB apps on blackbberry app world. After doing some search on google, I manage to find a link to download, but it doesn't work. I can only see blue screen and all I can do was klik the button 'back'. All other apps are still working normally. I've restarted my blackberry.. No improvement at all