Hi Nevin,
Can you give us more information on your SUP version? I know that in pervious versions there were some known issues if your Blackberry device was not paried with a corporate BES server?
Also, make sure that if you have not configured SUP to use push notifications through a BES that in your application connection template, the Blackberry push notifications are switched off.
If you are on a BES, make sure you check your policy is configured correctly to allow your app to run.
Cheers,
Brenton.