Am facing an unusual problem on blackberry, after i have signed my app with the 3 keys and say "load onto device" via Eclipse Java Plugin for Blackberry - the app loads successfully on the device, but when i click on it to launch it - does not open up, nor even a error or a dialog pops up. Please Help - Cant find a solution for this!
I have often had this issue using the 9800 device. After loading apps to the device it starts "not launching". If you go to options -> application manager -> your app's permissions you might see some permissions as custom. Setting these to "allow" fixes it. After a while it stopped launching even when allowed, deleting the app and letting the device reboot fixes it.
This is my personal experience, I don't know what the official bug/fix is