O thread estava sendo anulado.
   em System.Threading.Monitor.ReliableEnter(Object obj, Boolean& lockTaken)
   em Microsoft.Xna.Framework.Game.Draw(GameTime gameTime)
   em DungeonCrawler.DungeonCrawlerGame.Draw(GameTime gameTime)
   em Microsoft.Xna.Framework.Game.Tick()
   em Microsoft.Xna.Framework.SDL2_FNAPlatform.RunLoop(Game game)
   em Microsoft.Xna.Framework.Game.Run()
   em DungeonCrawler.Program.Main(String[] args)

LoadingThread
   em System.Threading.Monitor.ObjWait(Boolean exitContext, Int32 millisecondsTimeout, Object obj)
   em System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout, Boolean exitContext)
   em System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout)
   em System.Threading.ManualResetEventSlim.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   em Microsoft.Xna.Framework.Graphics.OpenGLDevice.ForceToMainThread(Action action)
   em Microsoft.Xna.Framework.Graphics.OpenGLDevice.SetTextureData2D(IGLTexture texture, SurfaceFormat format, Int32 x, Int32 y, Int32 w, Int32 h, Int32 level, IntPtr data, Int32 startIndex, Int32 elementCount, Int32 elementSizeInBytes)
   em Microsoft.Xna.Framework.Graphics.Texture2D.SetData[T](Int32 level, Nullable`1 rect, T[] data, Int32 startIndex, Int32 elementCount)
   em Microsoft.Xna.Framework.Content.Texture2DReader.Read(ContentReader reader, Texture2D existingInstance)
   em Microsoft.Xna.Framework.Content.ContentTypeReader`1.Read(ContentReader input, Object existingInstance)
   em Microsoft.Xna.Framework.Content.ContentReader.InnerReadObject[T](T existingInstance)
   em Microsoft.Xna.Framework.Content.ContentReader.ReadObject[T](T existingInstance)
   em Microsoft.Xna.Framework.Content.ContentReader.ReadObject[T]()
   em Microsoft.Xna.Framework.Content.ContentReader.ReadAsset[T]()
   em Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T](String assetName, Action`1 recordDisposableObject)
   em Microsoft.Xna.Framework.Content.ContentManager.Load[T](String assetName)
   em DungeonCrawler.GameTextures.LoadTextures(ContentManager content)
   em DungeonCrawler.LoadingScreenComponent.FullLoad()
   em System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   em System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   em System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   em System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   em System.Threading.ThreadHelper.ThreadStart()