We managed to investigate the behavior with empty tiles with Wraparound turned On. We can now confirm it is an issue in the RadMap control and we logged it in our feedback portal where you can track its status.
Map: Tiles are not loaded when wraparound is true and zoom level is above the provider's mapsource's MaxZoomLevel.
We also updated your telerik account points as a thanks for your cooperation.
The bug is related with the maximum zoom level that a specific provider supports and difference in the mechanism of loading tiles when wraparound feature is on/off. With that in mind , you can try a workaround without turning off the wraparound. After calling SetView, coerce the zoom level of RadMap the following way:
sender, RoutedEventArgs e)
var errorLocation1 =
(RadMap.ZoomLevel > 18)
RadMap.ZoomLevel = 18;
18 is actually the constant specified by the OsmTileMapSource's DefaultMaxZoomLevel property. Unfortunately, there is no elegant way to get it in code. You can add public property in your custom class to access MaxZoomLevel property of the OsmTileMapSource class.
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