Connect to the computer. Make an Explorer, not Home backup of your unit's contents.
Then use Explorer to delete all the loose files in the root of the unit, NO folders or their contents.
Connect to Home. Install the application offered. Disconnect properly from Home using the Device Disconnect icon.
Try it now.
I reinstalled as you said. It still won't leave streets blocked. about all I accomplished is that I lost my startup and shutdown images and even though I downloaded them again they will not install.
I think I made a mistake buying this unit.