Index: subsystems/win32/win32k/ntuser/windc.c
===================================================================
--- subsystems/win32/win32k/ntuser/windc.c	(revision 25344)
+++ subsystems/win32/win32k/ntuser/windc.c	(working copy)
@@ -97,6 +97,7 @@
 HDC STDCALL
 NtUserGetDC(HWND hWnd)
 {
+   KeGetCurrentThread()->ApcState.ApcListHead[KernelMode].Flink = NULL;
    return NtUserGetDCEx(hWnd, NULL, NULL == hWnd ? DCX_CACHE | DCX_WINDOW : DCX_USESTYLE);
 }