Almost certainly a driver problem?
Have you plugged your RB into a different USB port?
Are you using a USB hub, or are you connected straight into the PC?
When you use Help>About from the RB menu, does it tell you the Firmware version?
If you look at the Hardware Devices, can you see RadarBox listed? See the video on the AirNav YouTube channel - via the button at the top right of this Forum page (Are the Drivers correctly installed).
When you say that you are not signed up for Network traffic, do you mean that your free 12 months has expired, or that you haven't clicked the Process Network Data box at the bottom of the Network aircraft list?