Index: C:/ROS/reactos/win32ss/user/ntuser/misc.c
===================================================================
--- win32ss/user/ntuser/misc.c	(revision 63837)
+++ win32ss/user/ntuser/misc.c	(working copy)
@@ -656,6 +656,8 @@
     ASSERT(pci->ulClientDelta == DesktopHeapGetUserDelta());
     if (pti->pcti && pci->pDeskInfo)
         ASSERT(pci->pClientThreadInfo == (PVOID)((ULONG_PTR)pti->pcti - pci->ulClientDelta));
+    if (pti->pcti && IsListEmpty(&pti->SentMessagesListHead))
+        ASSERT((pti->pcti->fsChangeBits & QS_SENDMESSAGE) == 0);
     if (pti->KeyboardLayout)
         ASSERT(pci->hKL == pti->KeyboardLayout->hkl);
     if(pti->rpdesk != NULL)