diff --git a/qwt/src/qwt_abstract_scale_draw.cpp b/qwt/src/qwt_abstract_scale_draw.cpp
index 72f664c03..c29e226a0 100644
--- a/qwt/src/qwt_abstract_scale_draw.cpp
+++ b/qwt/src/qwt_abstract_scale_draw.cpp
@@ -184,7 +184,7 @@ void QwtAbstractScaleDraw::draw( QPainter *painter,
         {
             const double v = majorTicks[i];
             if ( d_data->scldiv.contains( v ) )
-                drawLabel( painter, majorTicks[i] );
+                drawLabel( painter, v );
         }
 
         painter->restore();
diff --git a/qwt/src/qwt_plot_scaleitem.cpp b/qwt/src/qwt_plot_scaleitem.cpp
index b5b27ee1e..212f5bee4 100644
--- a/qwt/src/qwt_plot_scaleitem.cpp
+++ b/qwt/src/qwt_plot_scaleitem.cpp
@@ -46,8 +46,6 @@ public:
 void QwtPlotScaleItem::PrivateData::updateBorders( const QRectF &canvasRect,
     const QwtScaleMap &xMap, const QwtScaleMap &yMap )
 {
-    canvasRectCache = canvasRect;
-
     QwtInterval interval;
     if ( scaleDraw->orientation() == Qt::Horizontal )
     {
@@ -350,7 +348,10 @@ void QwtPlotScaleItem::draw( QPainter *painter,
     if ( d_data->scaleDivFromAxis )
     {
         if ( canvasRect != d_data->canvasRectCache )
+        {
             d_data->updateBorders( canvasRect, xMap, yMap );
+            d_data->canvasRectCache = canvasRect;
+        }
     }
 
     QPen pen = painter->pen();
@@ -438,6 +439,7 @@ void QwtPlotScaleItem::updateScaleDiv( const QwtScaleDiv& xScaleDiv,
         {
             d_data->updateBorders( plt->canvas()->contentsRect(),
                 plt->canvasMap( xAxis() ), plt->canvasMap( yAxis() ) );
+            d_data->canvasRectCache = QRect();
         }
     }
 }
diff --git a/src/PerfPlot.cpp b/src/PerfPlot.cpp
index 906a81786..435ba5303 100644
--- a/src/PerfPlot.cpp
+++ b/src/PerfPlot.cpp
@@ -24,16 +24,47 @@
 #include <qwt_plot_curve.h>
 #include <qwt_plot_canvas.h>
 #include <qwt_plot_grid.h>
+#include <qwt_scale_widget.h>
 #include "RideItem.h"
 #include "RideFile.h"
 #include "PerfPlot.h"
 #include "StressCalculator.h"
 #include "Colors.h"
 
+// handle x-axis names
+class PPTimeScaleDraw: public QwtScaleDraw
+{
+    public:
+	PPTimeScaleDraw(const QDateTime &base):
+	    QwtScaleDraw(), baseTime(base) {
+		format = "MMM d";
+        QwtScaleDraw::invalidateCache();
+	    }
+	virtual QwtText label(double v) const
+	{
+	    QDateTime upTime = baseTime.addDays((int)v);
+	    return upTime.toString(format);
+	}
+    void setBase(QDateTime base)
+    {
+        baseTime = base;
+        invalidateCache();
+    }
+
+    private:
+	QDateTime baseTime;
+	QString format;
+
+};
+
 PerfPlot::PerfPlot() : STScurve(NULL), LTScurve(NULL), SBcurve(NULL), DAYcurve(NULL)
 {
     setInstanceName("PM Plot");
 
+    xsd = new PPTimeScaleDraw(QDateTime());
+    xsd->setTickLength(QwtScaleDiv::MajorTick, 3);
+    setAxisScaleDraw(QwtPlot::xBottom, xsd);
+
     insertLegend(new QwtLegend(), QwtPlot::BottomLegend);
     setAxisTitle(yLeft, "Exponentially Weighted Average Stress");
     setAxisTitle(xBottom, "Time (days)");
@@ -47,10 +78,6 @@ PerfPlot::PerfPlot() : STScurve(NULL), LTScurve(NULL), SBcurve(NULL), DAYcurve(N
 
     QwtScaleDraw *sd = new QwtScaleDraw;
     sd->setTickLength(QwtScaleDiv::MajorTick, 3);
-    setAxisScaleDraw(QwtPlot::xBottom, sd);
-
-    sd = new QwtScaleDraw;
-    sd->setTickLength(QwtScaleDiv::MajorTick, 3);
     setAxisScaleDraw(QwtPlot::yLeft, sd);
 
     sd = new QwtScaleDraw;
@@ -105,9 +132,11 @@ void PerfPlot::plot() {
     } else if (num < 364) {
 	tics  = 27;
     }
-    setAxisScale(xBottom, xmin, xmax,tics);
+    //setAxisScale(xBottom, xmin, xmax,tics);
+    //axisWidget(xBottom)->update();
 
-    setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw(startDate));
+    // set base
+    xsd->setBase(startDate);
 
     double width = appsettings->value(this, GC_LINEWIDTH, 20.0).toDouble();
 
@@ -172,6 +201,7 @@ void PerfPlot::plot() {
     SBcurve->setData(_sc->getDays()+xmin,_sc->getSBvalues()+xmin,num);
     SBcurve->attach(this);
 
+    axisWidget(QwtPlot::xBottom)->update();
     replot();
 
 }
@@ -205,4 +235,5 @@ PerfPlot::setAxisTitle(int axis, QString label)
     title.setFont(stGiles);
     QwtPlot::setAxisFont(axis, stGiles);
     QwtPlot::setAxisTitle(axis, title);
+    axisWidget(axis)->update();
 }
diff --git a/src/PerfPlot.h b/src/PerfPlot.h
index 211f92628..6185ccaa5 100644
--- a/src/PerfPlot.h
+++ b/src/PerfPlot.h
@@ -30,28 +30,7 @@
 #include "Settings.h"
 
 
-
-
-// handle x-axis names
-class TimeScaleDraw: public QwtScaleDraw
-{
-    public:
-	TimeScaleDraw(const QDateTime &base):
-	    baseTime(base) {
-		format = "MMM d";
-	    }
-	virtual QwtText label(double v) const
-	{
-	    QDateTime upTime = baseTime.addDays((int)v);
-	    return upTime.toString(format);
-	}
-    private:
-	QDateTime baseTime;
-	QString format;
-
-};
-
-
+class PPTimeScaleDraw;
 class PerfPlot : public QwtPlot
 {
     Q_OBJECT
@@ -64,6 +43,7 @@ class PerfPlot : public QwtPlot
 	int days;
 	QDateTime startDate;
 	StressCalculator *_sc;
+    PPTimeScaleDraw *xsd;
 	int xmin, xmax;
 
     public slots: