I am trying to gradually blend a bitmap onto the primary surface, it works one time but when I try to do it again, the lpDDSBack.lpSurface is set to 0x000000,which it was not in the first execution!, and I am getting an exception error, how could this be? First I load the bitmap into the directdrawsurface lpDDSBitmap using the DDLoadBitmap function! win* p; typedef struct win { LPDIRECTDRAW lpDD; LPDIRECTDRAWSURFACE lpDDSPrimary; LPDIRECTDRAWSURFACE lpDDSBack; LPDIRECTDRAWSURFACE lpDDSBitmap; LPDIRECTDRAWCLIPPER lpClipper; } p->lpDDSBitmap=DDLoadBitmap(p,p->lpDD,L"crystalcocktail.bmp"); IDirectDrawSurface * DDLoadBitmap(win* p,IDirectDraw *pdd, LPCTSTR szBitmap) { HBITMAP hbm; BITMAP bm; IDirectDrawSurface *pdds; hbm=SHLoadDIBitmap(szBitmap); if (hbm == NULL){ return NULL; } GetObject(hbm, sizeof(bm), &bm); // get size of bitmap // create a DirectDrawSurface for this bitmap pdds = CreateOffScreenSurface(pdd, bm.bmWidth, bm.bmHeight); if (pdds) { DDCopyBitmap(pdds, hbm, bm.bmWidth, bm.bmHeight); } DeleteObject(hbm); return pdds; } And then I Blit the bitmap surface to the Backbuffer using the Flip_Bitmap_To_Back(p): bool_t Flip_Bitmap_To_Back(win* p) { HRESULT ddrval; RECT rcRectSrc; RECT rcRectDest; POINT pt; // first we need to figure out where on the primary surface our window lives pt.x = 0; pt.y = 0; ClientToScreen(p->Wnd, &pt); GetClientRect(p->Wnd, &rcRectDest); OffsetRect(&rcRectDest, pt.x, pt.y); SetRect(&rcRectSrc, 0, 0, 472, 286); //var 472 286 ddrval =IDirectDrawSurface_Blt(p->lpDDSBack, &rcRectDest, p->lpDDSBitmap, &rcRectSrc, DDBLT_WAIT, NULL); if(ddrval==DDERR_SURFACELOST){ restoreAll(p); } } And then finally I uses the blendfunction BltAlpha(p->lpDDSPrimary,p->lpDDSBack,0,0,&r,128,RGBMODE_565); //var RGBMODE_565 } If I do this one more time the exception error occurs, and I don´t know why, could it be that the surface gets lost in some of the actions or????? Please help me someone, thanks Dani