Do you use IsTileCachingEnabled = True on the MapProvider ? If yes, you can try clearing the Map Cache.
Tile caching uses default path like the following:
C:\Documents and Settings\User\AppData\Local\TelerikMapCache\
You can clear the tile cache using the sample code below.
profile = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
cachePath = profile +
Also when you use a built-in map provider like Bing or OpenStreet then I wouldn't recommend to use the tile cache. By default the current version of RadMap for WPF uses cache of .Net and the request cache level is set to RequestCacheLevel.CacheIfAvailable. So, I would recommend using the RadMap tile cache feature for custom map providers only. When the nature of the tile server requires additional settings of the cache (for example when it doesn't provide correct expiration date for tiles).
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