diff --git a/FDTD/extensions/operator_ext_dispersive.cpp b/FDTD/extensions/operator_ext_dispersive.cpp
index e5e9723..ffc4c01 100644
--- a/FDTD/extensions/operator_ext_dispersive.cpp
+++ b/FDTD/extensions/operator_ext_dispersive.cpp
@@ -19,7 +19,19 @@
 
 #include "tools/array_ops.h"
 
-Operator_Ext_Dispersive::Operator_Ext_Dispersive(Operator* op)  : Operator_Extension(op)
+Operator_Ext_Dispersive::Operator_Ext_Dispersive(Operator* op) : Operator_Extension(op)
+{
+	m_curr_ADE_On = NULL;
+	m_volt_ADE_On = NULL;
+
+	m_LM_pos=NULL;
+	m_curr_ADE_On=NULL;
+	m_volt_ADE_On=NULL;
+
+	m_Order = 0;
+}
+
+Operator_Ext_Dispersive::Operator_Ext_Dispersive(Operator* op, Operator_Ext_Dispersive* op_ext) : Operator_Extension(op,op_ext)
 {
 	m_curr_ADE_On = NULL;
 	m_volt_ADE_On = NULL;
diff --git a/FDTD/extensions/operator_ext_dispersive.h b/FDTD/extensions/operator_ext_dispersive.h
index 02ca3fc..476d647 100644
--- a/FDTD/extensions/operator_ext_dispersive.h
+++ b/FDTD/extensions/operator_ext_dispersive.h
@@ -37,6 +37,8 @@ public:
 
 protected:
 	Operator_Ext_Dispersive(Operator* op);
+	//! Copy constructor
+	Operator_Ext_Dispersive(Operator* op, Operator_Ext_Dispersive* op_ext);
 
 	//! Dispersive order
 	int m_Order;
diff --git a/FDTD/extensions/operator_ext_lorentzmaterial.cpp b/FDTD/extensions/operator_ext_lorentzmaterial.cpp
index 9b25419..8cea4db 100644
--- a/FDTD/extensions/operator_ext_lorentzmaterial.cpp
+++ b/FDTD/extensions/operator_ext_lorentzmaterial.cpp
@@ -28,6 +28,14 @@ Operator_Ext_LorentzMaterial::Operator_Ext_LorentzMaterial(Operator* op) : Opera
 	i_ext_ADE = NULL;
 }
 
+Operator_Ext_LorentzMaterial::Operator_Ext_LorentzMaterial(Operator* op, Operator_Ext_LorentzMaterial* op_ext) : Operator_Ext_Dispersive(op,op_ext)
+{
+	v_int_ADE = NULL;
+	v_ext_ADE = NULL;
+	i_int_ADE = NULL;
+	i_ext_ADE = NULL;
+}
+
 Operator_Ext_LorentzMaterial::~Operator_Ext_LorentzMaterial()
 {
 	for (int i=0;i<m_Order;++i)
@@ -66,6 +74,13 @@ Operator_Ext_LorentzMaterial::~Operator_Ext_LorentzMaterial()
 	i_ext_ADE = NULL;
 }
 
+Operator_Extension* Operator_Ext_LorentzMaterial::Clone(Operator* op)
+{
+	if (dynamic_cast<Operator_Ext_LorentzMaterial*>(this)==NULL)
+		return NULL;
+	return new Operator_Ext_LorentzMaterial(op, this);
+}
+
 bool Operator_Ext_LorentzMaterial::BuildExtension()
 {
 	double dT = m_Op->GetTimestep();
diff --git a/FDTD/extensions/operator_ext_lorentzmaterial.h b/FDTD/extensions/operator_ext_lorentzmaterial.h
index ee4386c..a77a648 100644
--- a/FDTD/extensions/operator_ext_lorentzmaterial.h
+++ b/FDTD/extensions/operator_ext_lorentzmaterial.h
@@ -28,17 +28,22 @@ public:
 	Operator_Ext_LorentzMaterial(Operator* op);
 	virtual ~Operator_Ext_LorentzMaterial();
 
+	virtual Operator_Extension* Clone(Operator* op);
+
 	virtual bool BuildExtension();
 
 	virtual Engine_Extension* CreateEngineExtention();
 
 	virtual bool IsCylinderCoordsSave(bool closedAlpha, bool R0_included) const {return true;}
+	virtual bool IsCylindricalMultiGridSave(bool child) const {UNUSED(child); return true;}
 
 	virtual string GetExtensionName() const {return string("Drude/Lorentz Dispersive Material Extension");}
 
 	virtual void ShowStat(ostream &ostr) const;
 
 protected:
+	//! Copy constructor
+	Operator_Ext_LorentzMaterial(Operator* op, Operator_Ext_LorentzMaterial* op_ext);
 
 	//ADE update coefficients, array setup: coeff[N_order][direction][mesh_pos_index]
 	FDTD_FLOAT ***v_int_ADE;
diff --git a/FDTD/extensions/operator_extension.cpp b/FDTD/extensions/operator_extension.cpp
index dd8e189..5abb080 100644
--- a/FDTD/extensions/operator_extension.cpp
+++ b/FDTD/extensions/operator_extension.cpp
@@ -38,6 +38,8 @@ Operator_Extension::Operator_Extension(Operator* op, Operator_Extension* op_ext)
 	UNUSED(op_ext);
 	m_Op = op;
 	m_Op_Cyl = dynamic_cast<Operator_Cylinder*>(op);
+	if (m_Op_Cyl)
+		m_CC_R0_included=m_Op_Cyl->GetR0Included();
 }
 
 void Operator_Extension::ShowStat(ostream &ostr) const
diff --git a/FDTD/extensions/operator_extension.h b/FDTD/extensions/operator_extension.h
index 81c5b3e..5e5b7ca 100644
--- a/FDTD/extensions/operator_extension.h
+++ b/FDTD/extensions/operator_extension.h
@@ -62,7 +62,7 @@ public:
 
 protected:
 	Operator_Extension(Operator* op);
-	//! Copy constructor, returns NULL if extension cannot be copied...
+	//! Copy constructor
 	Operator_Extension(Operator* op, Operator_Extension* op_ext);
 
 	//FDTD Operator