Index: ntuser.c
===================================================================
--- win32ss/user/ntuser/ntuser.c	(revision 69520)
+++ win32ss/user/ntuser/ntuser.c	(working copy)
@@ -132,8 +132,10 @@
 // {
 
     /* Initialize the current thread */
-    Status = InitThreadCallback(PsGetCurrentThread());
-    if (!NT_SUCCESS(Status)) return Status;
+    //Status = InitThreadCallback(PsGetCurrentThread());
+    //if (!NT_SUCCESS(Status)) return Status;
+    // Already done by NtUserProcessConnect -> PsConvertToGuiThread
+    NT_ASSERT(PsGetCurrentThreadWin32Thread() != NULL);
 
 // }
 // Set Global SERVERINFO Error flags.