This is a reply to an old thread, but I mostly the same thing happen to an unlocked CNSouthernAfrica 2013.10 maps. Like the original poster, my unit would only show the magenta route until I zoomed as close in as 30 miles. (At 50 miles all was blank behind the magenta route. As I panned around the map I had plenty of square miles to view on a 30-mile limit, but at 50 miles+ anyplace on the map it went blank. I love this forum and I'm still wading through for answers, but I predict somebody has solved this problem out there. I eagerly await finding that solution.