Index: src/ch/ClipboardMonitor.cpp
===================================================================
diff -u -N -r8b7479db2ee71a3d00779c67fe6a1b1d9ec414b8 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/ch/ClipboardMonitor.cpp	(.../ClipboardMonitor.cpp)	(revision 8b7479db2ee71a3d00779c67fe6a1b1d9ec414b8)
+++ src/ch/ClipboardMonitor.cpp	(.../ClipboardMonitor.cpp)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -141,7 +141,7 @@
 					chcore::TTaskPtr spTask = pData->m_pTasks->CreateTask(tTaskDefinition);
 
 					// write spTask to a file
-					spTask->Store();
+					spTask->Store(true);
 
 					// start processing
 					spTask->BeginProcessing();
Index: src/ch/MainWnd.cpp
===================================================================
diff -u -N -r671f4b1792a20d98b186f4e0a9cc6a620dede019 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/ch/MainWnd.cpp	(.../MainWnd.cpp)	(revision 671f4b1792a20d98b186f4e0a9cc6a620dede019)
+++ src/ch/MainWnd.cpp	(.../MainWnd.cpp)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -396,9 +396,10 @@
 	case 1023:
 		// autosave timer
 		KillTimer(1023);
-		m_spTasks->Store();
+		m_spTasks->Store(false);
 		SetTimer(1023, GetPropValue<PP_PAUTOSAVEINTERVAL>(GetConfig()), NULL);
 		break;
+
 	case 3245:
 		// auto-delete finished tasks timer
 		KillTimer(3245);
@@ -412,6 +413,7 @@
 
 		SetTimer(3245, TM_AUTOREMOVE, NULL);
 		break;
+
 	case 8743:
 		{
 			// wait state handling section
@@ -569,7 +571,7 @@
 			{
 				chcore::TTaskPtr spTask = m_spTasks->ImportTask(strPath);
 				if(spTask)
-					spTask->Store();
+					spTask->Store(true);
 				bImported = true;
 			}
 			catch(icpf::exception& e)
Index: src/libchcore/TTask.cpp
===================================================================
diff -u -N -re96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/libchcore/TTask.cpp	(.../TTask.cpp)	(revision e96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3)
+++ src/libchcore/TTask.cpp	(.../TTask.cpp)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -191,17 +191,40 @@
 		}
 	}
 
-	void TTask::Store()
+	void TTask::Store(bool bForce)
 	{
 		if (GetTaskState() == eTaskState_LoadError)
 		{
 			DBTRACE0(_T("Task::Store() - not storing task as it was not loaded correctly\n"));
 			return;
 		}
 
-		TSimpleTimer timer(true);
 		DBTRACE0(_T("###### Task::Store() - starting\n"));
 
+		// ensure we're only running one serialization of this task at a time;
+		// (this is usually called from the gui thread (on timer) and at specific points
+		// of task processing; there were times where 
+		if(!bForce)
+		{
+			if (!m_mutexSerializer.try_lock())
+			{
+				DBTRACE0(_T("###### Task::Store() - serialization already running. Skipping.\n"));
+				return;
+			}
+		}
+		else
+		{
+			if (!m_mutexSerializer.try_lock())
+			{
+				DBTRACE0(_T("###### Task::Store() - waiting for serialization mutex...\n"));
+				m_mutexSerializer.lock();
+			}
+		}
+
+		std::unique_lock<std::mutex> locke(m_mutexSerializer, std::adopt_lock);
+
+		TSimpleTimer timer(true);
+
 		using namespace chcore;
 
 		{
@@ -550,7 +573,7 @@
 				m_tSubTaskContext.GetFilesCache().Clear();		// scanning for files did not finish processing, so the content of the files cache are useless
 
 			// save progress before killed
-			Store();
+			Store(true);
 
 			// reset flags
 			SetContinueFlag(false);
Index: src/libchcore/TTask.h
===================================================================
diff -u -N -re96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/libchcore/TTask.h	(.../TTask.h)	(revision e96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3)
+++ src/libchcore/TTask.h	(.../TTask.h)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -34,6 +34,8 @@
 #include "TTaskStatsSnapshot.h"
 #include "ISerializer.h"
 #include "TTaskBaseData.h"
+#include "TEvent.h"
+#include <mutex>
 
 namespace chcore
 {
@@ -66,7 +68,7 @@
 		void SetPriority(int nPriority);
 
 		void Load();
-		void Store();
+		void Store(bool bForce);
 
 		void BeginProcessing();
 
@@ -132,6 +134,7 @@
 #pragma warning(push)
 #pragma warning(disable: 4251)
 		ISerializerPtr m_spSerializer;
+		std::mutex m_mutexSerializer;
 		IFeedbackHandlerPtr m_spInternalFeedbackHandler;
 #pragma warning(pop)
 
Index: src/libchcore/TTaskManager.cpp
===================================================================
diff -u -N -re96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/libchcore/TTaskManager.cpp	(.../TTaskManager.cpp)	(revision e96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3)
+++ src/libchcore/TTaskManager.cpp	(.../TTaskManager.cpp)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -62,7 +62,7 @@
 
 		Add(spTask);
 
-		spTask->Store();
+		spTask->Store(true);
 
 		return spTask;
 	}
@@ -137,7 +137,7 @@
 		StopAllTasks();
 
 		// ensure everything is stored so that we can resume processing in the future
-		Store();
+		Store(true);
 
 		// now remove all tasks without serializing anymore (prevent accidental
 		// serialization)
@@ -436,7 +436,7 @@
 		}
 	}
 
-	void TTaskManager::Store()
+	void TTaskManager::Store(bool bForce)
 	{
 		TSimpleTimer timer(true);
 
@@ -450,7 +450,7 @@
 			for (size_t stIndex = 0; stIndex != m_tTasks.GetCount(); ++stIndex)
 			{
 				TTaskPtr spTask = m_tTasks.GetAt(stIndex).GetTask();
-				spTask->Store();
+				spTask->Store(bForce);
 			}
 		}
 
Index: src/libchcore/TTaskManager.h
===================================================================
diff -u -N -re96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3 -rba618764ec3c9221fa704e905a9f807bd85ed4c5
--- src/libchcore/TTaskManager.h	(.../TTaskManager.h)	(revision e96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3)
+++ src/libchcore/TTaskManager.h	(.../TTaskManager.h)	(revision ba618764ec3c9221fa704e905a9f807bd85ed4c5)
@@ -46,7 +46,7 @@
 
 		~TTaskManager();
 
-		void Store();
+		void Store(bool bForce);
 		void Load();
 
 		TTaskPtr CreateTask(const TTaskDefinition& tTaskDefinition);