diff --git a/DSView/pv/sigsession.cpp b/DSView/pv/sigsession.cpp
index a0a88c25..5fd2d991 100644
--- a/DSView/pv/sigsession.cpp
+++ b/DSView/pv/sigsession.cpp
@@ -758,7 +758,8 @@ namespace pv
                 break;
             } 
         }
- 
+
+        dsv_info("SigSession::init_signals(), clear signals");
         clear_signals();
 
         std::vector<view::Signal *>().swap(_signals);
@@ -854,6 +855,7 @@ namespace pv
 
         if (!sigs.empty())
         { 
+            dsv_info("SigSession::reload(), clear signals");
             clear_signals();
             std::vector<view::Signal *>().swap(_signals);
             _signals = sigs;
@@ -1989,7 +1991,7 @@ namespace pv
             } 
 
             init_signals();
-            dsv_info("%s", "Work mode is changed.");
+            dsv_info("Switch work mode to:%d", mode);
             broadcast_msg(DSV_MSG_DEVICE_MODE_CHANGED);
             return true;
         }
@@ -2070,7 +2072,7 @@ namespace pv
         {
             auto *p = _signals[i];
             p->sig_released(p);
-
+            
             DESTROY_QT_LATER(p);
         }
         _signals.clear();
diff --git a/DSView/pv/view/dsldial.cpp b/DSView/pv/view/dsldial.cpp
index 971a2029..e53b9df3 100644
--- a/DSView/pv/view/dsldial.cpp
+++ b/DSView/pv/view/dsldial.cpp
@@ -158,6 +158,12 @@ uint64_t dslDial::get_max()
 
 uint64_t dslDial::get_value()
 {
+    this->_div = this->_div;
+    
+    if (_sel < 0 || _sel >= _value.count()){
+        assert(false);
+    }
+
     return _value[_sel];
 }
 
diff --git a/DSView/pv/view/dsosignal.cpp b/DSView/pv/view/dsosignal.cpp
index 3cc837eb..cc0462ae 100644
--- a/DSView/pv/view/dsosignal.cpp
+++ b/DSView/pv/view/dsosignal.cpp
@@ -109,7 +109,7 @@ DsoSignal::DsoSignal(data::DsoSnapshot *data,
 
 DsoSignal::DsoSignal(const DsoSignal &o)
 :Signal(NULL)
-{
+{    
 }
 
 DsoSignal::DsoSignal(DsoSignal &o)
@@ -119,7 +119,7 @@ DsoSignal::DsoSignal(DsoSignal &o)
 
 DsoSignal::~DsoSignal()
 {
-    DESTROY_OBJECT(_vDial);
+    DESTROY_OBJECT(_vDial);  
 }
 
 void DsoSignal::set_scale(int height)
@@ -1502,6 +1502,7 @@ double DsoSignal::get_voltage(uint64_t index)
 
     const double value = *_data->get_samples(index, index, get_index());
     const int hw_offset = get_hw_offset();
+
     return (hw_offset - value) * _scale *
             _vDial->get_value() * _vDial->get_factor() *
             DS_CONF_DSO_VDIVS / get_view_rect().height();
@@ -1509,19 +1510,15 @@ double DsoSignal::get_voltage(uint64_t index)
 
 QString DsoSignal::get_voltage(double v, int p, bool scaled)
 {
-   // if (_vDial == NULL)
-     //   return "";
-
-    this->_hover_en = this->_hover_en;
-
     if (_vDial == NULL){
         assert(false);
-    } 
+    }
 
     if (scaled)
         v = v * _vDial->get_value() * _vDial->get_factor() * DS_CONF_DSO_VDIVS / get_view_rect().height();
     else
         v = v * _scale * _vDial->get_value() * _vDial->get_factor() * DS_CONF_DSO_VDIVS / get_view_rect().height();
+    
     return abs(v) >= 1000 ? QString::number(v/1000.0, 'f', p) + "V" : QString::number(v, 'f', p) + "mV";
 }
 
diff --git a/DSView/pv/view/xcursor.cpp b/DSView/pv/view/xcursor.cpp
index e4d6ea09..ca9e0c5c 100644
--- a/DSView/pv/view/xcursor.cpp
+++ b/DSView/pv/view/xcursor.cpp
@@ -25,6 +25,7 @@
 #include "view.h"
 #include "ruler.h"
 #include "dsosignal.h"
+#include "../log.h"
 
 #include <QPainter>
   
@@ -162,6 +163,10 @@ void XCursor::paint(QPainter &p, const QRect &rect, XCur_type highlight,  int or
         auto sig = _view.session().get_signal_by_index(_sig_index);
         if (sig != NULL){
             _dsoSig = dynamic_cast<DsoSignal*>(sig);
+
+            if (_dsoSig != NULL){
+                connect(_dsoSig, SIGNAL(sig_released(void*)), this, SLOT(on_signal_deleted(void*)));
+            }
         }
     }