Realized I had forgotten to initialize the UserInput struct to 0.

Client/Audio/Audio.hpp

@@ -19,4 +19,5 @@
 
 namespace Audio {
     int Initialize();
+    void Shutdown();
 }

Client/Audio/Startup.cpp

@@ -24,8 +24,6 @@ HANDLE Thread;
 IXAudio2 *pXAudio2 = NULL;
 IXAudio2MasteringVoice *MasterVoice = NULL;
 
-void Shutdown();
-
 int Initialize(){
     HRESULT result;
     

Client/Client.cpp

@@ -74,13 +74,13 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
         return ERROR_INIT | ERROR_INIT_LOGIC | ERROR_LOGIC_CREATE_SCENE;
     }
     
-    LARGE_INTEGER PreviousTime;
-    QueryPerformanceCounter(&PreviousTime);
-    
     ShowWindow(Window::hWnd, SW_SHOW);
     SetForegroundWindow(Window::hWnd);
     SetFocus(Window::hWnd);
     
+    LARGE_INTEGER PreviousTime;
+    QueryPerformanceCounter(&PreviousTime);
+    
     while(true){
         MSG msg;
         while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){
@@ -102,18 +102,15 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
         
         PreviousTime.QuadPart = CurrentTime.QuadPart;
         QueryPerformanceCounter(&CurrentTime);
-        unsigned SleepDuration = (unsigned)
-            ((System::FramePeriod - (float)(CurrentTime.QuadPart-PreviousTime.QuadPart)/System::ClockFreq.QuadPart) * 1000);
-        if(SleepDuration > 1) Sleep(SleepDuration);
-    }
-    
-    MSG msg;
-    while(GetMessage(&msg, NULL, 0, 0))
-    {
-        TranslateMessage(&msg);
-        DispatchMessage(&msg);
+        float SleepDuration =
+            (System::FramePeriod - (float)(CurrentTime.QuadPart-PreviousTime.QuadPart)/System::ClockFreq.QuadPart) * 1000;
+        if(SleepDuration > 1) Sleep((unsigned) SleepDuration);
     }
 
+    ShowWindow(Window::hWnd, SW_HIDE);
+    Audio::Shutdown();
+    Graphics::Shutdown();
+    
     Shutdown();
     return 0;
 }

Client/Graphics/Graphics.hpp

@@ -21,6 +21,7 @@
 //Graphics/Startup.cpp
 namespace Graphics {
     int Initialize();
+    void Shutdown();
     extern HDC hDC;
     extern HGLRC hRC;
     

Client/Graphics/Startup.cpp

@@ -23,8 +23,6 @@ HANDLE Thread;
 HDC hDC;
 HGLRC hRC;
 
-void Shutdown();
-
 int Initialize(){
     hDC = GetDC(Window::hWnd);
     if(hDC == NULL){

Client/MessageHandler.cpp

@@ -44,6 +44,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         return 0;
     
     case WM_CLOSE:
+        System::UserInput.CloseWindow = true;
         PostQuitMessage(0);
         return 0;
 

Client/Scene/Scene.hpp

@@ -51,8 +51,9 @@ class LoginScreen : public Scene {
     int Run(float){
         if(System::UserInput.CloseWindow){
             System::Shutdown = true;
+            return 0;
         }
-        return 0;
+        return 1;
     }
 
   public:

Client/System/System.cpp

@@ -27,6 +27,8 @@ namespace System {
     UserInput_t UserInput;
     
     int Initialize(){
+        memset(&UserInput, 0, sizeof(UserInput));
+        
         QueryPerformanceFrequency(&ClockFreq);
         
         DEVMODE dm;