Weird mouse cursor

Just started to write my little freecell game and came across a weird glitch. Whenever I start the app I get a busy cursor (the hourglass) until I move my mouse outside the window. Any idea what's causing this so I can nerf it?

Code:

#include <windows.h>
#include "card.h"

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){
    int deck[MAXCOL][MAXPOS];
    HINSTANCE card_dll;
    MSG msg;
    HWND hwnd;
    WNDCLASSEX wc;
    pfcdtInit    cdtInit;
    pfcdtInit    cdtDraw;
    pfcdtAnimate cdtDrawEx;
    pfcdtTerm    cdtTerm; 

    /*load cards.dll*/
    if((card_dll = LoadLibrary("cards.dll")) == 0){
         MessageBox(NULL, "Unable to load cards.dll", "Error", MB_OK | MB_ICONERROR);
         return -1;
    }

    /*fill in the function pointers with valid addresses*/
    cdtInit   = GetProcAddress(card_dll, "cdtInit");
    cdtDraw   = GetProcAddress(card_dll, "cdtDraw");
    cdtDrawEx = GetProcAddress(card_dll, "cdtAnimate");
    cdtTerm   = (pfcdtTerm)GetProcAddress(card_dll, "cdtTerm");
    
    shuffle(deck, 1337);

    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = CS_DBLCLKS;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon  (hInstance, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(hInstance, IDC_ARROW);
    wc.hbrBackground = CreateSolidBrush(RGB(0,255,0));
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = "Freecell";
    wc.hIconSm       = NULL;

    if(RegisterClassEx(&wc) == 0){
        MessageBox(NULL, "Failed to register window", "Error", MB_OK | MB_ICONERROR);
        return -1;
    }
    /*if all goes well we have a window on-screen after this*/
    hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, "Freecell", "........Cell", WS_VISIBLE | WS_SYSMENU | WS_CAPTION, CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hInstance, NULL);
    
    if(hwnd == NULL){
        MessageBox(NULL, "Unable to create window", "Error", MB_OK | MB_ICONERROR);
        return -1;
    }
    ShowWindow(hwnd, SW_SHOW);
    /*message loop*/    
    while(GetMessage(&msg, hwnd, 0, 0) > 0){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    /*clean up time*/
    cdtTerm();
    FreeLibrary(card_dll);
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){
    HDC hdc;
    PAINTSTRUCT ps;
        switch(uMsg){

/*                     case WM_CREATE:
                        hdc = BeginPaint(hwnd, &ps);
                        EndPaint(hwnd, &ps);   
                     break;      
*/
                     case WM_DESTROY:
                          PostQuitMessage(0);
                     break;
                     default:
                          return DefWindowProc(hwnd, uMsg, wParam, lParam);
                     break;        
        }
    return 0;
}

It means your app is busy. If the cursor is moved outside it is no longer considered busy. Does the cursor eventually switch back?

hInstance must be NULL for the LoadIcon and LoadCursor calls if you want to retrieve system icons/cursors.

Thanks SMurf, that got it.