We have a WPF app with v2019.2.618.45 controls that has been working fine with the ArcGisMapProvider for a couple of years but has stopped displaying tiles in the last few days.
Have tried clearing MapCache (settings are .IsTileCachingEnabled = true; and .RequestCacheLevel = RequestCacheLevel.CacheIfAvailable;) but no difference.
That's with the release builds. Running in debug there's still an intermittent problem but more tiles load. Setting .IsTileCachingEnabled = false; in debug and all tiles seem to load correctly.
Anything that explains this behaviour or suggestions to debug? It will take some time to push a new release build and don't want to do this unnecessarily. We also don't want to lose the cached tiles.