Close game interface before showing crash form and don't show it at all on dedicated servers.

OpenRA.FileFormats/Graphics/IGraphicsDevice.cs

@@ -58,6 +58,8 @@ namespace OpenRA.FileFormats.Graphics
 		void DisableDepthBuffer();
 
 		void SetBlendMode(BlendMode mode);
+
+		void Quit();
 	}
 
 	public interface IVertexBuffer<T>

OpenRA.Game/Support/Program.cs

@@ -50,9 +50,12 @@ namespace OpenRA
 			Log.Write("exception", "{0}", rpt);
 			Console.Error.WriteLine(rpt);
 
-			if (Game.Settings.Debug.ShowFatalErrorDialog)
+			if (Game.Settings.Debug.ShowFatalErrorDialog && !Game.Settings.Server.Dedicated)
+			{
+				Game.Renderer.Device.Quit();
 				FatalErrorDialog.Show();
 			}
+		}
 
 		static StringBuilder BuildExceptionReport(Exception e)
 		{

OpenRA.Renderer.Cg/GraphicsDevice.cs

@@ -61,6 +61,12 @@ namespace OpenRA.Renderer.Cg
 			FragmentProfile = CgGl.cgGLGetLatestProfile(CgGl.CG_GL_FRAGMENT);
 		}
 
+		public override void Quit()
+		{
+			Tao.Cg.Cg.cgDestroyContext(Context);
+			base.Quit();
+		}
+
 		public override IShader CreateShader(string name) { return new Shader(this, name); }
 	}
 }

OpenRA.Renderer.Null/NullGraphicsDevice.cs

@@ -35,6 +35,8 @@ namespace OpenRA.Renderer.Null
 			WindowSize = size;
 		}
 
+		public void Quit() { }
+
 		public void EnableScissor(int left, int top, int width, int height) { }
 		public void DisableScissor() { }
 

OpenRA.Renderer.SdlCommon/SdlGraphics.cs

@@ -106,6 +106,11 @@ namespace OpenRA.Renderer.SdlCommon
 			return surf;
 		}
 
+		public virtual void Quit()
+		{
+			Sdl.SDL_Quit();
+		}
+
 		int ModeFromPrimitiveType(PrimitiveType pt)
 		{
 			switch (pt)