It's working fine for me. Have you updated the os? If yes, you have to check the BBM update in BlackBerry wrold. As I needed to update yesterday after I had the 10.3.1 update.
It's a good idea but some of the apps are even not available for 10.3.1 what I used on 10.2.1. It's not nice at all! I'm missing some BlackBerry app and some others too... all the apps should work fine and smooth with the nem update...I think.