I have the Blackberry world 8830. I'm running BBM 4.0. Out of nowhere when I try to select bbm from my main menu it won't let me click on it. Also when i run the "mouse" over it it doesn't even recognize it as bbm. It was working earlier in the day. I want to erase bbm and reinstall but I don't know where I can download this from all I find is 5.0 which is not compatible with my phone. Someone please help!