- WINSCR: So after looking over all the logs from WCG and now from Jacob Klein a pattern started to emerge. At the end of the log files the last message logged was 0x12 which translates into WM_QUIT. The latest documentation on WM_QUIT states it should never show up in the message loop to begin with. The docs now say that WM_QUIT should not be sent to the message loop by way of PostMessage. We have been doing things this way for over 5 years. Change the shutdown logic so that only the primary curtain window can call PostQuitMessage() and all other curtain windows just exit when they receive a WM_DESTROY message. I'm not sure what causes this to be a problem on some machines and not others. But preliminary results from Jacob are encouraging.