Problems with BBM

I recently changed from a z10 to a z30 and once I changed, I stopped getting notifications for new messages on blackberry messenger. Even when I click on the list of current conversations, it still has old messages displayed. I have to click on each person individually to see if they've sent anything new. Does anyone know how I could fix this problem?

Posted via CB10

Did you do a device switch when you went up to a Z30? Have you changed OSes recently? Have you tried rebooting your phone? Did you sign in with your BBID on your new phone?