Map - Terrian white out with icons present

[slyst]

Was happening during all my runs yesterday. When I open my map (M) the terrain is all white, but I can see Buildings, FB's and such. The forests, rivers, roads and other terrain are absent. If I leave the map open the terrain will eventually load after 30secs-2 minutes. The terrain will always eventually load. Very annoying when your popping the map open for a sec to see marks and can't relate them to terrain markers.