diff --git a/sleepyhead/Graphs/gGraph.cpp b/sleepyhead/Graphs/gGraph.cpp
index b258d2b8..6e9c0e92 100644
--- a/sleepyhead/Graphs/gGraph.cpp
+++ b/sleepyhead/Graphs/gGraph.cpp
@@ -1394,3 +1394,21 @@ int GetXHeight(QFont *font)
     QFontMetrics fm(*font);
     return fm.xHeight();
 }
+
+void gGraph::dumpInfo() {
+    for (int i = 0; i < m_layers.size(); i++) {
+        Layer *ll = m_layers[i];
+
+        if (!ll->visible()) { continue; }
+
+        if (ll->position() == LayerCenter) {
+            gLineChart *lc = dynamic_cast<gLineChart *>(ll);
+            if (lc != nullptr) {
+                QString text = lc->getMetaString(currentTime());
+                if (!text.isEmpty()) {
+                    mainwin->log(text);
+                }
+            }
+        }
+    }
+}
diff --git a/sleepyhead/Graphs/gGraph.h b/sleepyhead/Graphs/gGraph.h
index 17fc5f26..99b1f46f 100644
--- a/sleepyhead/Graphs/gGraph.h
+++ b/sleepyhead/Graphs/gGraph.h
@@ -314,6 +314,8 @@ class gGraph : public QObject
     //! \brief Key Pressed event
     virtual void keyReleaseEvent(QKeyEvent *event);
 
+    void dumpInfo();
+
     //! \brief Change the current selected time boundaries by mult, from origin position origin_px
     void ZoomX(double mult, int origin_px);
 
diff --git a/sleepyhead/Graphs/gGraphView.cpp b/sleepyhead/Graphs/gGraphView.cpp
index ac9abc73..592ba341 100644
--- a/sleepyhead/Graphs/gGraphView.cpp
+++ b/sleepyhead/Graphs/gGraphView.cpp
@@ -347,6 +347,16 @@ gGraphView::~gGraphView()
     m_graphs.clear();
 }
 
+void gGraphView::dumpInfo()
+{
+    QDateTime dt=QDateTime::fromMSecsSinceEpoch(currentTime());
+    QString text = "==================== Line Cursor Dump ====================\n"+dt.toString("MMM dd - HH:mm:ss:zzz");
+    mainwin->log(text);
+    for (int i=0;i<m_graphs.size();i++) {
+        m_graphs[i]->dumpInfo();
+    }
+}
+
 bool gGraphView::usePixmapCache()
 {
     //use_pixmap_cache is an overide setting
@@ -1845,6 +1855,9 @@ void gGraphView::keyPressEvent(QKeyEvent *event)
         p_profile->appearance->setLineCursorMode(!p_profile->appearance->lineCursorMode());
         timedRedraw(0);
     }
+    if (event->key() == Qt::Key_F10) {
+        dumpInfo();
+    }
 
     if (event->key() == Qt::Key_Tab) {
         event->ignore();
diff --git a/sleepyhead/Graphs/gGraphView.h b/sleepyhead/Graphs/gGraphView.h
index 94af3dbb..a7ae4c49 100644
--- a/sleepyhead/Graphs/gGraphView.h
+++ b/sleepyhead/Graphs/gGraphView.h
@@ -381,6 +381,8 @@ class gGraphView
 
     inline QPoint currentMousePos() const { return m_mouse; }
 
+    void dumpInfo();
+
     // for profiling purposes, a count of lines drawn in a single frame
     int lines_drawn_this_frame;
     int quads_drawn_this_frame;
diff --git a/sleepyhead/Graphs/gLineChart.cpp b/sleepyhead/Graphs/gLineChart.cpp
index d1c01353..1995b5ae 100644
--- a/sleepyhead/Graphs/gLineChart.cpp
+++ b/sleepyhead/Graphs/gLineChart.cpp
@@ -29,6 +29,7 @@ gLineChart::gLineChart(ChannelID code, QColor col, bool square_plot, bool disabl
     m_line_color = col;
     m_report_empty = false;
     lines.reserve(50000);
+    lasttime = 0;
 }
 gLineChart::~gLineChart()
 {
@@ -164,41 +165,40 @@ bool gLineChart::mouseMoveEvent(QMouseEvent *event, gGraph *graph)
     return true;
 }
 
-QString gLineChart::getMetaString(ChannelID code, qint64 xpos)
+QString gLineChart::getMetaString(qint64 time)
 {
-    static qint64 lasttime = 0;
-    static ChannelID lastcode = NoChannel;
-    static QString lasttext;
+    lasttext = QString();
+    if (!m_day) return lasttext;
 
-    QString text;
-    if (!((lasttime == xpos) && (lastcode == code))) {
-        EventDataType val = 0, val2 = 0, val3 = 0;
-        if (m_day) {
-            if (code == CPAP_Pressure) {
-                CPAPMode mode = (CPAPMode)round(m_day->settings_wavg(CPAP_Mode));
-                if (mode >= MODE_BIPAP) {
-                    val = m_day->lookupValue(CPAP_EPAP, xpos);
-                    val2 = m_day->lookupValue(CPAP_IPAP, xpos);
-                    val3 = val2 - val;
-                    text=QString("%1: %2 %3 %4:%5 %3 %6:%7 %3").arg(STR_TR_EPAP).arg(val,0,'f',1).arg(STR_UNIT_CMH2O).arg(STR_TR_IPAP).arg(val2,0,'f',1).arg(STR_TR_PS).arg(val3,0,'f',1);
-                } else {
-                    val = m_day->lookupValue(code, xpos);
-                    text = QString("%1: %2 %3").arg(schema::channel[code].label()).arg(val).arg(schema::channel[code].units());
-                }
-            } else {
-                val = m_day->lookupValue(code, xpos);
-                text = QString("%1: %2 %3").arg(schema::channel[code].label()).arg(val).arg(schema::channel[code].units());
+
+    EventDataType val;
+
+    EventDataType ipap = 0, epap = 0;
+    bool addPS = false;
+
+    for (int i=0; i<m_codes.size(); ++i) {
+        ChannelID code = m_codes[i];
+        if (m_day->channelHasData(code)) {
+            val = m_day->lookupValue(code, time);
+            lasttext += " "+QString("%1: %2 %3").arg(schema::channel[code].label()).arg(val,0,'f',2).arg(schema::channel[code].units());
+
+            if (code == CPAP_IPAP) {
+                ipap = val;
+                addPS = true;
+            }
+            if (code == CPAP_EPAP) {
+                epap = val;
             }
         }
 
-        lastcode = code;
-        lasttime = xpos;
-        lasttext = text;
-    } else {
-        text = lasttext;
+    }
+    if (addPS) {
+        val = ipap - epap;
+        lasttext += " "+QString("%1: %2 %3").arg(schema::channel[CPAP_PS].label()).arg(val,0,'f',2).arg(schema::channel[CPAP_PS].units());
     }
 
-    return text;
+    lasttime = time;
+    return lasttext;
 }
 
 // Time Domain Line Chart
@@ -274,26 +274,19 @@ void gLineChart::paint(QPainter &painter, gGraph &w, const QRegion &region)
         qint64 time = w.currentTime();
 
 
-        QDateTime dt=QDateTime::fromMSecsSinceEpoch(time);
-
-        QString text = dt.toString("MMM dd - HH:mm:ss:zzz");
-
-
         if ((time > minx) && (time < maxx)) {
             double xpos = (time - minx) * xmult;
             painter.setPen(QPen(QBrush(QColor(0,255,0,255)),1));
             painter.drawLine(left+xpos, top-w.marginTop()-3, left+xpos, top+height+w.bottom-1);
         }
 
-        //QString text = getMetaString(m_codes[0], time);
-        for (int i=0; i<m_codes.size(); ++i) {
-            ChannelID code = m_codes[i];
-            if (m_day->channelHasData(code)) {
-                EventDataType val = m_day->lookupValue(code, time);
-                text += " "+QString("%1: %2 %3").arg(schema::channel[code].label()).arg(val).arg(schema::channel[code].units());
-            }
+        if ((time != lasttime) || lasttext.isEmpty()) {
+            getMetaString(time);
         }
 
+        QDateTime dt=QDateTime::fromMSecsSinceEpoch(time);
+        QString text = dt.toString("MMM dd - HH:mm:ss:zzz") + lasttext;
+
         int wid, h;
         GetTextExtent(text, wid, h);
         w.renderText(text, left + width/2 - wid/2, top-h+5);
diff --git a/sleepyhead/Graphs/gLineChart.h b/sleepyhead/Graphs/gLineChart.h
index 993cc399..c4723371 100644
--- a/sleepyhead/Graphs/gLineChart.h
+++ b/sleepyhead/Graphs/gLineChart.h
@@ -78,11 +78,12 @@ class gLineChart: public Layer
     //! \brief Enable or Disable the subplot identified by code.
     void setPlotEnabled(ChannelID code, bool b) { m_enabled[code] = b; }
 
+    QString getMetaString(qint64 time);
+
   protected:
     //! \brief Mouse moved over this layers area (shows the hover-over tooltips here)
     virtual bool mouseMoveEvent(QMouseEvent *event, gGraph *graph);
 
-    QString getMetaString(ChannelID code, qint64 time);
 
     bool m_report_empty;
     bool m_square_plot;
@@ -103,6 +104,9 @@ class gLineChart: public Layer
     QHash<ChannelID, bool> m_enabled;
 
     QVector<QLine> lines;
+
+    QString lasttext;
+    qint64 lasttime;
 };
 
 #endif // GLINECHART_H
diff --git a/sleepyhead/SleepLib/common.cpp b/sleepyhead/SleepLib/common.cpp
index 9fbc23d8..94df5bc8 100644
--- a/sleepyhead/SleepLib/common.cpp
+++ b/sleepyhead/SleepLib/common.cpp
@@ -123,7 +123,7 @@ QString STR_UNIT_BreathsPerMinute;
 QString STR_UNIT_Percentage;
 QString STR_UNIT_Unknown;
 QString STR_UNIT_Ratio;
-QString STR_UNIT_Severety;
+QString STR_UNIT_Severity;
 QString STR_UNIT_Degrees;
 
 QString STR_MessageBox_Question;
@@ -305,9 +305,9 @@ void initializeStrings()
     STR_UNIT_Litres = QObject::tr("Litres");
     STR_UNIT_ml = QObject::tr("ml");        // millilitres
     STR_UNIT_BreathsPerMinute = QObject::tr("Breaths/min"); // Breaths per minute
-    STR_UNIT_Unknown = QObject::tr("??");
+    STR_UNIT_Unknown = QObject::tr("?");
     STR_UNIT_Ratio = QObject::tr("ratio");
-    STR_UNIT_Severety = QObject::tr("Severety (0-1)");
+    STR_UNIT_Severity = QObject::tr("Severity (0-1)");
     STR_UNIT_Degrees = QObject::tr("Degrees");
 
     STR_MessageBox_Question = QObject::tr("Question");
diff --git a/sleepyhead/SleepLib/common.h b/sleepyhead/SleepLib/common.h
index 07177461..c1291523 100644
--- a/sleepyhead/SleepLib/common.h
+++ b/sleepyhead/SleepLib/common.h
@@ -139,7 +139,7 @@ extern QString STR_UNIT_Percentage;
 extern QString STR_UNIT_BreathsPerMinute;
 extern QString STR_UNIT_Unknown;
 extern QString STR_UNIT_Ratio;
-extern QString STR_UNIT_Severety;
+extern QString STR_UNIT_Severity;
 extern QString STR_UNIT_Degrees;
 
 extern QString STR_MessageBox_Question;
diff --git a/sleepyhead/SleepLib/loader_plugins/resmed_loader.cpp b/sleepyhead/SleepLib/loader_plugins/resmed_loader.cpp
index d47a613a..3195ccab 100644
--- a/sleepyhead/SleepLib/loader_plugins/resmed_loader.cpp
+++ b/sleepyhead/SleepLib/loader_plugins/resmed_loader.cpp
@@ -1301,10 +1301,12 @@ int ResmedLoader::Open(QString path)
 
     backup_path += RMS9_STR_datalog + "/";
 
+#ifdef LOCK_RESMED_SESSIONS
     // Have to sacrifice these features to get access to summary data.
     p_profile->session->setCombineCloseSessions(0);
     p_profile->session->setDaySplitTime(QTime(12,0,0));
     p_profile->session->setIgnoreShortSessions(false);
+#endif
 
     /////////////////////////////////////////////////////////////////////////////
     // Scan through new file list and import sessions
diff --git a/sleepyhead/SleepLib/schema.cpp b/sleepyhead/SleepLib/schema.cpp
index c0e4b045..a1fd1d27 100644
--- a/sleepyhead/SleepLib/schema.cpp
+++ b/sleepyhead/SleepLib/schema.cpp
@@ -337,7 +337,7 @@ void init()
     schema::channel.add(GRP_CPAP, new Channel(CPAP_FLG               = 0x1113, WAVEFORM,    SESSION, "FLG",
                         QObject::tr("Flow Limitation"),
                         QObject::tr("Graph showing severity of flow limitations"),   QObject::tr("Flow Limit."),
-                        STR_UNIT_Severety,      DEFAULT,    QColor("dark gray")));
+                        STR_UNIT_Severity,      DEFAULT,    QColor("dark gray")));
 
     schema::channel.add(GRP_CPAP, new Channel(CPAP_TgMV              = 0x1114, WAVEFORM,    SESSION,
                         "TgMV",              QObject::tr("Target Minute Ventilation"),
diff --git a/sleepyhead/logger.cpp b/sleepyhead/logger.cpp
index d8280c54..d8806303 100644
--- a/sleepyhead/logger.cpp
+++ b/sleepyhead/logger.cpp
@@ -99,6 +99,14 @@ void LogThread::append(QString msg)
     strlock.unlock();
 }
 
+void LogThread::appendClean(QString msg)
+{
+    strlock.lock();
+    buffer.append(msg);
+    strlock.unlock();
+}
+
+
 void LogThread::quit() {
     qDebug() << "Shutting down logging thread";
     running = false;
diff --git a/sleepyhead/logger.h b/sleepyhead/logger.h
index bcc6c148..0ae287b6 100644
--- a/sleepyhead/logger.h
+++ b/sleepyhead/logger.h
@@ -25,6 +25,7 @@ public:
 
     void run();
     void append(QString msg);
+    void appendClean(QString msg);
     bool isRunning() { return running; }
 
     void quit();
diff --git a/sleepyhead/mainwindow.cpp b/sleepyhead/mainwindow.cpp
index af15bf31..4b4e3146 100644
--- a/sleepyhead/mainwindow.cpp
+++ b/sleepyhead/mainwindow.cpp
@@ -169,8 +169,7 @@ MainWindow::MainWindow(QWidget *parent) :
 #endif
 #endif
 
-
-
+#ifdef LOCK_RESMED_SESSIONS
     QList<Machine *> machines = p_profile->GetMachines(MT_CPAP);
     for (QList<Machine *>::iterator it = machines.begin(); it != machines.end(); ++it) {
         QString mclass=(*it)->GetClass();
@@ -184,6 +183,7 @@ MainWindow::MainWindow(QWidget *parent) :
             break;
         }
     }
+#endif
 
     ui->actionToggle_Line_Cursor->setChecked(p_profile->appearance->lineCursorMode());
 
@@ -374,6 +374,11 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
+void MainWindow::log(QString text)
+{
+    logger->appendClean(text);
+}
+
 
 void MainWindow::Notify(QString s, QString title, int ms)
 {
diff --git a/sleepyhead/mainwindow.h b/sleepyhead/mainwindow.h
index 8f38028d..504f26ea 100644
--- a/sleepyhead/mainwindow.h
+++ b/sleepyhead/mainwindow.h
@@ -136,6 +136,8 @@ class MainWindow : public QMainWindow
 
     void startImportDialog() { on_action_Import_Data_triggered(); }
 
+    void log(QString text);
+
   public slots:
     //! \brief Recalculate all event summaries and flags
     void doReprocessEvents();
diff --git a/sleepyhead/preferencesdialog.cpp b/sleepyhead/preferencesdialog.cpp
index 8a8c5643..52e407f0 100644
--- a/sleepyhead/preferencesdialog.cpp
+++ b/sleepyhead/preferencesdialog.cpp
@@ -71,6 +71,7 @@ PreferencesDialog::PreferencesDialog(QWidget *parent, Profile *_profile) :
         }*/
     }
 
+#ifdef LOCK_RESMED_SESSIONS
     QList<Machine *> machines = p_profile->GetMachines(MT_CPAP);
     for (QList<Machine *>::iterator it = machines.begin(); it != machines.end(); ++it) {
         QString mclass=(*it)->GetClass();
@@ -81,7 +82,7 @@ PreferencesDialog::PreferencesDialog(QWidget *parent, Profile *_profile) :
             break;
         }
     }
-
+#endif
 
     QLocale locale = QLocale::system();
     QString shortformat = locale.dateFormat(QLocale::ShortFormat);
diff --git a/sleepyhead/sleepyhead.pro b/sleepyhead/sleepyhead.pro
index 7e964b35..7b3e195b 100644
--- a/sleepyhead/sleepyhead.pro
+++ b/sleepyhead/sleepyhead.pro
@@ -23,6 +23,9 @@ exists($$PWD/../BrokenGL) {
     QT += opengl
 }
 
+#The following forces ResMed session locking.. it *may* not be necessary.. I'm still trying to assess this properly.
+DEFINES += LOCK_RESMED_SESSIONS
+
 #CONFIG += c++11
 CONFIG += rtti