diff --git a/DSView/pv/dialogs/about.cpp b/DSView/pv/dialogs/about.cpp
index 9d813a9f..836de5aa 100755
--- a/DSView/pv/dialogs/about.cpp
+++ b/DSView/pv/dialogs/about.cpp
@@ -38,7 +38,8 @@ namespace dialogs {
 About::About(QWidget *parent) :
     DSDialog(parent, true)
 {
-    setFixedHeight(360);
+    setFixedHeight(600);
+    setFixedWidth(800);
 
     #if defined(__x86_64__) || defined(_M_X64)
         QString arch = "x64";
@@ -57,8 +58,8 @@ About::About(QWidget *parent) :
                       .arg(arch);
 
     QString url = tr("Website: <a href=\"%1\" style=\"color:#C0C0C0\">%1</a><br />"
-                     "Gitbub: <a href=\"%2\" style=\"color:#C0C0C0\">%2</a><br />"
-                     "Copyright：<a href=\"%3\" style=\"color:#C0C0C0\">%3</a><br />"
+                     "Github: <a href=\"%2\" style=\"color:#C0C0C0\">%2</a><br />"
+                     "Copyright:<a href=\"%3\" style=\"color:#C0C0C0\">%3</a><br />"
                      "<br /><br />")
                   .arg(QApplication::organizationDomain())
                   .arg("https://github.com/DreamSourceLab/DSView")
@@ -109,7 +110,6 @@ About::About(QWidget *parent) :
 
     layout()->addLayout(xlayout);
     setTitle(tr("About"));
-    setFixedWidth(500);
 }
 
 About::~About()
diff --git a/DSView/pv/dock/dsotriggerdock.cpp b/DSView/pv/dock/dsotriggerdock.cpp
index f646f357..5766e15b 100755
--- a/DSView/pv/dock/dsotriggerdock.cpp
+++ b/DSView/pv/dock/dsotriggerdock.cpp
@@ -53,10 +53,10 @@ DsoTriggerDock::DsoTriggerDock(QWidget *parent, SigSession &session) :
 
     _position_label = new QLabel(_widget);
     _position_spinBox = new QSpinBox(_widget);
-    _position_spinBox->setRange(0, 99);
+    _position_spinBox->setRange(1, 99);
     _position_spinBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
     _position_slider = new QSlider(Qt::Horizontal, _widget);
-    _position_slider->setRange(0, 99);
+    _position_slider->setRange(1, 99);
     connect(_position_slider, SIGNAL(valueChanged(int)), _position_spinBox, SLOT(setValue(int)));
     connect(_position_spinBox, SIGNAL(valueChanged(int)), _position_slider, SLOT(setValue(int)));
     connect(_position_slider, SIGNAL(valueChanged(int)), this, SLOT(pos_changed(int)));
diff --git a/DSView/pv/view/dsosignal.cpp b/DSView/pv/view/dsosignal.cpp
index ea510127..3be0d94e 100755
--- a/DSView/pv/view/dsosignal.cpp
+++ b/DSView/pv/view/dsosignal.cpp
@@ -73,7 +73,7 @@ DsoSignal::DsoSignal(boost::shared_ptr<pv::device::DevInst> dev_inst,
     _auto_cnt(0),
     _hover_en(false),
     _hover_index(0),
-    _hover_point(QPointF(0, 0)),
+    _hover_point(QPointF(-1, -1)),
     _hover_value(0)
 {
     QVector<uint64_t> vValue;
@@ -1307,7 +1307,7 @@ void DsoSignal::paint_hover_measure(QPainter &p, QColor fore, QColor back)
 {
     const int hw_offset = get_hw_offset();
     // Hover measure
-    if (_hover_en) {
+    if (_hover_en && _hover_point != QPointF(-1, -1)) {
         QString hover_str = get_voltage(hw_offset - _hover_value, 2);
         const int hover_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
             Qt::AlignLeft | Qt::AlignTop, hover_str).width() + 10;
@@ -1331,6 +1331,10 @@ void DsoSignal::paint_hover_measure(QPainter &p, QColor fore, QColor back)
     while (i != _view->get_cursorList().end()) {
         float pt_value;
         const QPointF pt = get_point((*i)->index(), pt_value);
+        if (pt == QPointF(-1, -1)) {
+            i++;
+            continue;
+        }
         QString pt_str = get_voltage(hw_offset - pt_value, 2);
         const int pt_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
             Qt::AlignLeft | Qt::AlignTop, pt_str).width() + 10;
@@ -1500,7 +1504,7 @@ bool DsoSignal::get_hover(uint64_t &index, QPointF &p, double &value)
 
 QPointF DsoSignal::get_point(uint64_t index, float &value)
 {
-    QPointF pt = QPointF(0, 0);
+    QPointF pt = QPointF(-1, -1);
 
     if (!enabled())
         return pt;