Index: src/libchcore/TWin32ErrorFormatter.cpp
===================================================================
diff -u -N -r8068e0c351055554340ac9755d1bc846893bf2b8 -r7e407d35b44ec7482a112ef382e4619cf5d96172
--- src/libchcore/TWin32ErrorFormatter.cpp	(.../TWin32ErrorFormatter.cpp)	(revision 8068e0c351055554340ac9755d1bc846893bf2b8)
+++ src/libchcore/TWin32ErrorFormatter.cpp	(.../TWin32ErrorFormatter.cpp)	(revision 7e407d35b44ec7482a112ef382e4619cf5d96172)
@@ -19,6 +19,7 @@
 #include "stdafx.h"
 #include "TWin32ErrorFormatter.h"
 #include <algorithm>
+#include <atltrace.h>
 
 namespace chcore
 {
@@ -57,7 +58,12 @@
 			strData.ReleaseBufferSetLength(iPos < 0 ? 0 : iPos);
 		}
 		else
+		{
+			if(dwPos == 0)
+				ATLTRACE(L"Cannot format error message. Error code=%lu\n", GetLastError());
+
 			strData.ReleaseBufferSetLength(std::min(dwPos, dwMaxError - 1));
+		}
 
 		strData.TrimRightSelf(_T("\r\n"));