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Drove back ~ 150 miles from Charlotte yesterday. Two things were weird with the nav and screen: 1). Route line was only partially drawn between departure and arrival points, and 2). Different routes were displayed depending on the amount of zoom.
I had a related issue, and then I changed the setting to just show the streets (not the images). That seemed to work, but it wouldn't show traffic.
It also didn't show the blue navigation line.
I seem to have lost my blue route line. It's shown a partial line as well. Strange.