diff --git a/slsDetectorGui/include/qTabPlot.h b/slsDetectorGui/include/qTabPlot.h
index 016f130d6..9ed83be7e 100644
--- a/slsDetectorGui/include/qTabPlot.h
+++ b/slsDetectorGui/include/qTabPlot.h
@@ -136,6 +136,9 @@ private slots:
 	/** Enables the range of the z axis */
 	void EnableZRange();
 
+	/** Return true if valid */
+	bool CheckZRange(QString value);
+
 	/** Set Plot to none, data graph, histogram*/
 	void SetPlot();
 
diff --git a/slsDetectorGui/slsDetectorPlotting/src/SlsQt2DPlotLayout.cxx b/slsDetectorGui/slsDetectorPlotting/src/SlsQt2DPlotLayout.cxx
index 74769e76e..df80824a5 100644
--- a/slsDetectorGui/slsDetectorPlotting/src/SlsQt2DPlotLayout.cxx
+++ b/slsDetectorGui/slsDetectorPlotting/src/SlsQt2DPlotLayout.cxx
@@ -133,32 +133,43 @@ void SlsQt2DPlotLayout::ResetRange(){
 
 
 void SlsQt2DPlotLayout::ResetZMinZMax(bool zmin, bool zmax, double min, double max){
-	z_range_ne->SetNumber(min,0);
-	z_range_ne->SetNumber(max,1);
+
+	if(zmin || zmax)		zRangeChecked = true;
+	else					zRangeChecked = false;
+
+	if(zmin)		z_range_ne->SetNumber(min,0);
+	if(zmax)		z_range_ne->SetNumber(max,1);
+
 
 	//refind z limits
 	the_plot->SetZMinMax();
-	if(btnLogz->isChecked()) the_plot->SetZMinimumToFirstGreaterThanZero();
+	//finds zmin value from hist
+	if(btnLogz->isChecked())
+		the_plot->SetZMinimumToFirstGreaterThanZero();
 
-	//first time check validity
-	if(zmax)			z_range_ne->SetValue(max,0);
-	else				z_range_ne->SetValue(the_plot->GetZMaximum(),1);
+	if(zRangeChecked){
 
-	if(zmin)			z_range_ne->SetValue(min,0);
-	else				z_range_ne->SetValue(the_plot->GetZMinimum(),0);
+		//if value not given, take max or min of plot
+		if(zmax)			z_range_ne->SetValue(max,0);
+		else				z_range_ne->SetValue(the_plot->GetZMaximum(),1);
+
+		if(zmin)			z_range_ne->SetValue(min,0);
+		else				z_range_ne->SetValue(the_plot->GetZMinimum(),0);
+
+		//check if zmin and zmax is same or not a proper double value
+		//if(zmin && zmax){
+			bool same = (z_range_ne->GetValue(0)==z_range_ne->GetValue(1)) ? 1:0;
+			if(!z_range_ne->IsValueOk(0)||same) z_range_ne->SetValue(the_plot->GetZMinimum(),0);
+			if(!z_range_ne->IsValueOk(1)||same) z_range_ne->SetValue(the_plot->GetZMaximum(),1);
+		//}
+
+		z_range_ne->SetRange(the_plot->GetZMinimum(),z_range_ne->GetValue(1),0);
+		z_range_ne->SetRange(z_range_ne->GetValue(0),the_plot->GetZMaximum(),1);
+
+		//set histogram range
+		the_plot->SetZMinMax(z_range_ne->GetValue(0),z_range_ne->GetValue(1));
 
-	if(zmin && zmax){
-		bool same = (z_range_ne->GetValue(0)==z_range_ne->GetValue(1)) ? 1:0;
-		if(!z_range_ne->IsValueOk(0)||same) z_range_ne->SetValue(the_plot->GetZMinimum(),0);
-		if(!z_range_ne->IsValueOk(1)||same) z_range_ne->SetValue(the_plot->GetZMaximum(),1);
 	}
-
-	z_range_ne->SetRange(the_plot->GetZMinimum(),z_range_ne->GetValue(1),0);
-	z_range_ne->SetRange(z_range_ne->GetValue(0),the_plot->GetZMaximum(),1);
-
-	//set histogram range
-	the_plot->SetZMinMax(z_range_ne->GetValue(0),z_range_ne->GetValue(1));
-
 	the_plot->Update();
 }
 
@@ -216,6 +227,7 @@ void SlsQt2DPlotLayout::SetZRange(double zmin, double zmax){
 	ResetRange();
 }
 
+
 void SlsQt2DPlotLayout::EnableZRange(bool enable){
 #ifdef VERBOSE
 	cout<<"Setting Z Range Enable to "<<enable<<endl;
diff --git a/slsDetectorGui/slsDetectorPlotting/src/SlsQtNumberEntry.cxx b/slsDetectorGui/slsDetectorPlotting/src/SlsQtNumberEntry.cxx
index 780e23224..541eae1eb 100644
--- a/slsDetectorGui/slsDetectorPlotting/src/SlsQtNumberEntry.cxx
+++ b/slsDetectorGui/slsDetectorPlotting/src/SlsQtNumberEntry.cxx
@@ -253,7 +253,7 @@ double SlsQtNumberEntry::SetNumber(double v,int which_number_field){
     }
     if(validator_double[i]){
       QString s = QString::number(v);
-      validator_double[i]->fixup(s);
+      //validator_double[i]->fixup(s);//commented out as it ignores the zmax values
       num_field[i]->setText(s);
     }
   }else if(spin_box[i]){
@@ -280,7 +280,7 @@ void SlsQtNumberEntry::SetRange(int min, int max,int which_number_field){
 void SlsQtNumberEntry::SetRange(double min, double max,int which_number_field){
   int i = (which_number_field<0||which_number_field>1) ? 0:which_number_field;
   if(min>max){
-    cout<<"Warning: SetRange(double,double) no effect min >= max"<<endl;
+    cout<<"Warning: SetRange(double,double) no effect min("<<min<<") >= max("<<max<<")"<<endl;
   }else{
     if(validator_int[i])    cout<<"Waring can not call SetRange(double,double) with \"int\" type Validator"<<endl;
     if(validator_double[i]) validator_double[i]->setRange(min,max,validator_double[i]->decimals());
@@ -407,7 +407,13 @@ double SlsQtNumberEntry::GetNumber(int which_number_field,bool* ok){
 
   if(num_field[i]){
     if(validator_int[i]) return num_field[i]->text().toInt(ok);
-    else                 return num_field[i]->text().toDouble(ok);
+    else                 {
+    	bool k;
+    	cout<<"val:"<<num_field[i]->text().toDouble(&k)<<endl;
+    	cout<<"ok:"<<k<<endl;
+
+    	return num_field[i]->text().toDouble(ok);
+    }
   }
   else if(spin_box[i])   return spin_box[i]->value();
   else                   {if(ok) *ok=0;}
diff --git a/slsDetectorGui/src/qTabPlot.cpp b/slsDetectorGui/src/qTabPlot.cpp
index 336358f48..97f73a078 100644
--- a/slsDetectorGui/src/qTabPlot.cpp
+++ b/slsDetectorGui/src/qTabPlot.cpp
@@ -510,8 +510,11 @@ void qTabPlot::SetAxesRange(){
 
 
 void qTabPlot::SetZRange(){
-//	emit SetZRangeSignal(dispZMin->text().toDouble(),dispZMax->text().toDouble());
-	emit ResetZMinZMaxSignal(chkZMin->isChecked(),chkZMax->isChecked(),dispZMin->text().toDouble(),dispZMax->text().toDouble());
+	emit ResetZMinZMaxSignal(
+			(chkZMin->isChecked() && CheckZRange(dispZMin->text())),
+			(chkZMax->isChecked() && CheckZRange(dispZMax->text())),
+			dispZMin->text().toDouble(),
+			dispZMax->text().toDouble());
 }
 
 
@@ -519,9 +522,30 @@ void qTabPlot::SetZRange(){
 
 
 void qTabPlot::EnableZRange(){
+
 	dispZMin->setEnabled(chkZMin->isChecked());
 	dispZMax->setEnabled(chkZMax->isChecked());
-	emit ResetZMinZMaxSignal(chkZMin->isChecked(),chkZMax->isChecked(),dispZMin->text().toDouble(),dispZMax->text().toDouble());
+	emit ResetZMinZMaxSignal(
+			(chkZMin->isChecked() && CheckZRange(dispZMin->text())),
+			(chkZMax->isChecked() && CheckZRange(dispZMax->text())),
+			dispZMin->text().toDouble(),
+			dispZMax->text().toDouble());
+}
+
+
+//-------------------------------------------------------------------------------------------------------------------------------------------------
+
+
+bool qTabPlot::CheckZRange(QString value){
+	if(value.isEmpty())
+		return false;
+
+	bool ok;
+	value.toDouble(&ok);
+	if(!ok)
+		return false;
+
+	return true;
 }