We are experiencing an issue in Windows 8.1 with the .NET Quartz release. When we attempt to add a graphic with a polygon geometry to a graphics overlay, we get a windows fatal error message box that terminates the application. We cannot catch it in any way, and logs from Event Viewer don't really give any good description.
Source code for this can be found here: GitHub - cleppanen/ArcGISRuntime-DotNet-Maptips-1: A simple demonstration of the use of "maptips" with the ArcGISRuntime…
There is a region in the MainWindow.xaml.cs where the errant code is. Also attached is the event viewer log of the application crashing.