The most current one seems to be that the software has corrupted and is beyond repair. Upon launching it you are greeted with "MobileBroadband has encounted a problem". Uninstalling it, removing any instances of the usb device in the registry and reinstalling the latest version of the software doesn't help. I've had to reload a few machines lately because i can't for the life of me get it going again.. Has anyone successfully resurrected it?
Edit: Plugging said usb stick into another machine works.. Also once the problem machine is reloaded the mobile broadband software is happy again.