03-11-2013 08:03 AM
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You can try Re-installing BBM which might help , to do that On your Homescreen Go to Options > Device Application Management > Locate and delete BlackBerry Messenger from there. After deleting do a Battery Pull Restart like this device POWERED ON remove the battery wait a min. then re-insert it back .
After reboot from your BlackBerry Browser browse to www.blackberry.com/bbm and the most recent available for your device .After reinstalling see if that helps
If you're having BBM7 then your BBM Contacts are integrated with your BlackBerry ID , after installing when you login with your BlackBerry ID your Contacts will be restored back , but if you're having any previous persion then first do a local backup , you can backup in your Media card, refer to this KB for further help
KB20554 How to back up and restore the BlackBerry Messenger contact list