Ask your contacts that are in the same area as yours if they're having the same issue. If you're the only one, Back-up your contacts and try uninstalling your bbm and install it again, I had the same issue and deleting my bbm solved my problem. Good luck!
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Help please,am also experiencing the same problem. I use a z10 and my bbm has refused to change display picture for over a week now. I have done countless hard resets but still no change.am in nigeria by the way. I dont know how to uninstall bbm