Add a default exception handler. The default Windows one doesn't always show a message properly.

smx-config/App.xaml.cs

@@ -13,11 +13,19 @@ namespace smx_config
 
         App()
         {
+            AppDomain.CurrentDomain.UnhandledException += UnhandledExceptionEventHandler;
+
             if(Helpers.GetDebug())
                 SMX_Internal_OpenConsole();
             CurrentSMXDevice.singleton = new CurrentSMXDevice();
         }
 
+        private void UnhandledExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
+        {
+            string message = e.ExceptionObject.ToString();
+            MessageBox.Show("SMXConfig encountered an unexpected error:\n\n" + message, "SMXConfig");
+        }
+
         protected override void OnExit(ExitEventArgs e)
         {
             base.OnExit(e);