Index: src/ch/TShellExtensionClient.cpp
===================================================================
diff -u -N -r8068e0c351055554340ac9755d1bc846893bf2b8 -rb2102d724fda96a2533b866dbf1efca9f499713b
--- src/ch/TShellExtensionClient.cpp	(.../TShellExtensionClient.cpp)	(revision 8068e0c351055554340ac9755d1bc846893bf2b8)
+++ src/ch/TShellExtensionClient.cpp	(.../TShellExtensionClient.cpp)	(revision b2102d724fda96a2533b866dbf1efca9f499713b)
@@ -44,6 +44,8 @@
 	HRESULT hResult = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
 	if(SUCCEEDED(hResult))
 		m_bInitialized = true;
+	else if(hResult == RPC_E_CHANGED_MODE)
+		return S_FALSE;
 
 	return hResult;
 }
Index: src/ch/ch.cpp
===================================================================
diff -u -N -rf8fcbbd1d2321cf0c8be79526c449384af654e49 -rb2102d724fda96a2533b866dbf1efca9f499713b
--- src/ch/ch.cpp	(.../ch.cpp)	(revision f8fcbbd1d2321cf0c8be79526c449384af654e49)
+++ src/ch/ch.cpp	(.../ch.cpp)	(revision b2102d724fda96a2533b866dbf1efca9f499713b)
@@ -329,21 +329,31 @@
 	m_spLog = logger::MakeLogger(logger::TAsyncMultiLogger::GetInstance()->CreateLoggerData(strLogPath, m_spAppLoggerConfig), L"App");
 
 	LOG_INFO(m_spLog) << _T("============================ Initializing Copy Handler ============================");
-	LOG_INFO(m_spLog) << _T("");
 
 	// ================================= COM ========================================
 	LOG_INFO(m_spLog) << _T("Initializing COM");
 
 	HRESULT hResult = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
 	if(FAILED(hResult))
 	{
-		CString strMsg;
-		strMsg.Format(_T("Cannot initialize COM, the application will now exit (result = 0x%lx)"), hResult);
+		// NOTE: with CH code (including external libraries directly referenced by it) the RPC_E_CHANGED_MODE error code
+		// should not occur. One of the users reported such problem - it is unclear whether there is something being injected
+		// into CH process or there is some other problem. It seems that RPC_E_CHANGED_MODE error is not a blocker to CH use,
+		// so we're allowing the initialization to continue.
+		if(hResult != RPC_E_CHANGED_MODE)
+		{
+			CString strMsg;
+			strMsg.Format(_T("Cannot initialize COM, the application will now exit (result = 0x%lx)"), hResult);
 
-		LOG_ERROR(m_spLog) << strMsg;
-		AfxMessageBox(strMsg, MB_ICONERROR | MB_OK);
-		return FALSE;
+			LOG_ERROR(m_spLog) << strMsg;
+			AfxMessageBox(strMsg, MB_ICONERROR | MB_OK);
+			return FALSE;
+		}
+
+		LOG_WARNING(m_spLog) << L"COM already initialized (CoInitializeEx returned RPC_E_CHANGED_MODE)";
 	}
+	else
+		m_bComInitialized = true;
 
 	// ================================= Resource manager ========================================
 	LOG_INFO(m_spLog) << _T("Initializing resource manager...");
@@ -792,8 +802,13 @@
 
 	m_tShellExtClient.Close();
 
-	LOG_INFO(m_spLog) << _T("Pre-exit step - uninitializing COM");
-	CoUninitialize();
+	if(m_bComInitialized)
+	{
+		LOG_INFO(m_spLog) << _T("Pre-exit step - uninitializing COM");
+		CoUninitialize();
+	}
+	else
+		LOG_WARNING(m_spLog) << _T("COM was not initialized by CH. Leaving uninit to original caller.");
 
 	LOG_INFO(m_spLog) << _T("============================ Leaving Copy Handler ============================");
 
Index: src/ch/ch.h
===================================================================
diff -u -N -ra08ca9e12d93e9a036a5cf739348ff3ef2a58be8 -rb2102d724fda96a2533b866dbf1efca9f499713b
--- src/ch/ch.h	(.../ch.h)	(revision a08ca9e12d93e9a036a5cf739348ff3ef2a58be8)
+++ src/ch/ch.h	(.../ch.h)	(revision b2102d724fda96a2533b866dbf1efca9f499713b)
@@ -75,6 +75,7 @@
 	logger::TMultiLoggerConfigPtr m_spEngineLoggerConfig;
 
 	CWnd *m_pMainWindow;
+	bool m_bComInitialized = false;
 
 	DECLARE_MESSAGE_MAP()