Have you had your BlackBerry replaced and now mass storage mode will not work? Mass storage mode allows you to connect your BlackBerry and copy files to and from the device as if it was a USB Flash Drive.
I tore my hair out trying to figure out why this was happening and then stumbled on the fix. The Internet beats waiting for hours on the support lines or being told to do crazy things like wipe your device, when the solution is to run a simple little program.
Hopefully, this will help some of you with the same problem.