diff --git a/oscar/Graphs/gLineChart.cpp b/oscar/Graphs/gLineChart.cpp
index caf4243e..b23da328 100644
--- a/oscar/Graphs/gLineChart.cpp
+++ b/oscar/Graphs/gLineChart.cpp
@@ -26,6 +26,7 @@
 
 #define EXTRA_ASSERTS 1
 
+#if 0
 QDataStream & operator<<(QDataStream & stream, const DottedLine & dot)
 {
     stream << dot.code;
@@ -46,6 +47,7 @@ QDataStream & operator>>(QDataStream & stream, DottedLine & dot)
     dot.type = (ChannelCalcType)tmp;
     return stream;
 }
+#endif
 
 QColor darken(QColor color, float p)
 {
diff --git a/oscar/SleepLib/profiles.cpp b/oscar/SleepLib/profiles.cpp
index e44ebe8b..e7aa2a10 100644
--- a/oscar/SleepLib/profiles.cpp
+++ b/oscar/SleepLib/profiles.cpp
@@ -1049,6 +1049,8 @@ Profile *Get()
     return profiles[getUserName()];;
 }
 
+//profiles.xml is never read so it does not need to be saved.
+#if 0
 void saveProfileList()
 {
     QString filename = p_pref->Get("{home}/profiles.xml");
@@ -1078,6 +1080,7 @@ void saveProfileList()
 
     file.close();
 }
+#endif
 
 int CleanupProfile(Profile *prof)
 {
@@ -1157,7 +1160,8 @@ void Scan()
         p_pref->Save();
     }
     // Update profiles.xml for mobile version
-    saveProfileList();
+    // profiles.xml is never read so it does not need to be saved.
+    // saveProfileList();
 }
 
 
@@ -1993,7 +1997,8 @@ const quint16 chandata_version = 1;
 void Profile::saveChannels()
 {
     // First save the XML version for Mobile versions
-    schema::channel.Save(Get("{DataFolder}/") + "channels.xml");
+    // Profile/User/chanels.xml is not read so it does not need to be saved
+    // schema::channel.Save(Get("{DataFolder}/") + "channels.xml");
 
     QString filename = Get("{DataFolder}/") + "channels.dat";
     QFile f(filename);
diff --git a/oscar/SleepLib/schema.cpp b/oscar/SleepLib/schema.cpp
index 6d07a5a5..93852407 100644
--- a/oscar/SleepLib/schema.cpp
+++ b/oscar/SleepLib/schema.cpp
@@ -47,7 +47,7 @@ void resetChannels();
 
 ChannelList channel;
 Channel EmptyChannel;
-Channel *SessionEnabledChannel;
+// SessionEnabledChannel is not used//Channel *SessionEnabledChannel;
 
 QHash<QString, ChanType> ChanTypes;
 QHash<QString, DataType> DataTypes;
@@ -91,11 +91,13 @@ void init()
     schema_initialized = true;
 
     EmptyChannel = Channel(0, DATA, MT_UNKNOWN, DAY, "Empty", "Empty", "Empty Channel", "", "");
+    #if 0 // SessionEnabledChannel is not used
     SessionEnabledChannel = new Channel(1, DATA, MT_UNKNOWN, DAY, "Enabled", "Enabled", "Session Enabled", "", "");
 
     channel.channels[1] = SessionEnabledChannel;
     channel.names["Enabled"] = SessionEnabledChannel;
     SESSION_ENABLED = 1;
+#endif  // SessionEnabledChannel is not used
     ChanTypes["data"] = DATA;
     //Types["waveform"]=WAVEFORM;
     ChanTypes["setting"] = SETTING;
@@ -695,6 +697,7 @@ void ChannelList::add(QString group, Channel *chan)
     }
 }
 
+#if 0 // Profile/User/chanels.xml is not read so it does not need to be saved
 bool ChannelList::Save(QString filename)
 {
     if (filename.isEmpty())
@@ -757,6 +760,7 @@ bool ChannelList::Save(QString filename)
 
     return true;
 }
+#endif  // Profile/User/chanels.xml is not read so it does not need to be saved
 
 } // namespace
 
diff --git a/oscar/mainwindow.cpp b/oscar/mainwindow.cpp
index 31389f3a..a584b4c1 100644
--- a/oscar/mainwindow.cpp
+++ b/oscar/mainwindow.cpp
@@ -274,7 +274,7 @@ void MainWindow::closeEvent(QCloseEvent * event)
             QThread::msleep(1000);
             QApplication::processEvents();
         }
-        schema::channel.Save();
+        // Profile/User/chanels.xml is not read so it does not need to be saved//schema::channel.Save();
         if (p_profile) {
             CloseProfile();
         }
diff --git a/oscar/statistics.cpp b/oscar/statistics.cpp
index bc433317..d9792a19 100644
--- a/oscar/statistics.cpp
+++ b/oscar/statistics.cpp
@@ -142,7 +142,18 @@ void Statistics::loadRXChanges()
 
     in >> rxitems;
 
+    {   // Bug Fix. during testing, a crash occured due to a null machie value. in saveRxChanges. out << rx.machine->loaderName()
+        QList<QDate> toErase;
+        for (auto ri = rxitems.begin(); ri != rxitems.end();++ri ) {
+            RXItem rxitem = ri.value();
+            if (rxitem.machine==0) toErase.append(ri.key());
+        }
+        for (auto date : toErase) {
+            rxitems.remove(date) ;
+        }
+    }
 }
+
 void Statistics::saveRXChanges()
 {
     QString path = p_profile->Get("{" + STR_GEN_DataFolder + "}/RXChanges.cache" );