I have a Pearl on Verizon (8130)
BBM: 5.0.0.57
OS: 4.5.0.175

Through messenger, I can compose and send PIN messages, email & sms. I can make phone calls. In short everything works as expected EXCEPT:

When I am using BBM, trackball presses and the enter key don't work as expected. For example, from BBM main screen, I can press the menu key and the menu pops up. I can scroll to (e.g.) "Options". When I press the trackball, it ignores me. When I hit the enter key, it ignores me. The menu stays open but the "Options" sub menu does not open.

Another example:

When I am on the BBM main screen I can scroll down to "Chats", click the trackball and I see all my chats (crazy, but it works here). However, scrolling to a chat and then hitting the trackball or the enter key results in BBM ignoring me. The cursor stays on the chat, but it does not open.

Effectively, I cannot use BBM.

If I pull the battery, it will work correctly for a bit and then restart the same behaviour. Maybe 10 minutes, maybe two hours.

Any ideas?

update the os if there is one avail? I see you are using os 4.x and bbm 5.x

I don't know. Should that matter?

A few thoughts, it seems like a software issue. I would downgrade to a lower BBM. If still no success, I would wipe the device and reinstall the OS. In addition, remove the media card and see how the phone operates without any unneeded software. My response parallels theringer

just take the backup up and format the device...........may be it work.....if not than remove the bbm and install it again........agin not than upgrade ur software....than its a softwar problem..............