diff --git a/FDTD/processfields.cpp b/FDTD/processfields.cpp
index bb10899..49214c7 100644
--- a/FDTD/processfields.cpp
+++ b/FDTD/processfields.cpp
@@ -110,9 +110,12 @@ double ProcessFields::CalcTotalEnergy()
 		{
 			for (pos[2]=0;pos[2]<Op->numLines[2];++pos[2])
 			{
-				energy+=fabs(Eng->volt[0][pos[0]][pos[1]][pos[2]] * Eng->curr[0][pos[0]][pos[1]][pos[2]]);
-				energy+=fabs(Eng->volt[1][pos[0]][pos[1]][pos[2]] * Eng->curr[1][pos[0]][pos[1]][pos[2]]);
-				energy+=fabs(Eng->volt[2][pos[0]][pos[1]][pos[2]] * Eng->curr[2][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[0][pos[0]][pos[1]][pos[2]] * Eng->curr[1][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[0][pos[0]][pos[1]][pos[2]] * Eng->curr[2][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[1][pos[0]][pos[1]][pos[2]] * Eng->curr[0][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[1][pos[0]][pos[1]][pos[2]] * Eng->curr[2][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[2][pos[0]][pos[1]][pos[2]] * Eng->curr[0][pos[0]][pos[1]][pos[2]]);
+				energy+=fabs(Eng->volt[2][pos[0]][pos[1]][pos[2]] * Eng->curr[1][pos[0]][pos[1]][pos[2]]);
 			}
 		}
 	}
diff --git a/FDTD/processing.cpp b/FDTD/processing.cpp
index f4d16a8..34e19dd 100644
--- a/FDTD/processing.cpp
+++ b/FDTD/processing.cpp
@@ -94,7 +94,7 @@ void ProcessingArray::DeleteAll()
 
 int ProcessingArray::Process()
 {
-	int nextProcess=1e100;
+	int nextProcess=maxInterval;
 	//this could be done nicely in parallel??
 	for (size_t i=0;i<ProcessArray.size();++i)
 	{
diff --git a/FDTD/processing.h b/FDTD/processing.h
index f0c073c..a5cd4e3 100644
--- a/FDTD/processing.h
+++ b/FDTD/processing.h
@@ -58,7 +58,7 @@ protected:
 class ProcessingArray
 {
 public:
-	ProcessingArray() {};
+	ProcessingArray(unsigned int maximalInterval) {maxInterval=maximalInterval;}
 	~ProcessingArray() {};
 
 	void AddProcessing(Processing* proc);
@@ -69,6 +69,7 @@ public:
 	int Process();
 
 protected:
+	unsigned int maxInterval;
 	vector<Processing*> ProcessArray;
 };
 
diff --git a/openems.cpp b/openems.cpp
index 499dcf6..e8834a8 100644
--- a/openems.cpp
+++ b/openems.cpp
@@ -173,7 +173,7 @@ int openEMS::SetupFDTD(const char* file)
 
 	//*************** setup processing ************//
 	cout << "Setting up processing..." << endl;
-	PA = new ProcessingArray();
+	PA = new ProcessingArray(Nyquist);
 
 	double start[3];
 	double stop[3];
@@ -274,11 +274,13 @@ void openEMS::RunFDTD()
 		if (t_diff>4)
 		{
 			currE = ProcField.CalcTotalEnergy();
-			if ((currE>0) && (currE>maxE))
+			if (currE>maxE)
 				maxE=currE;
 			cout << "Timestep: " << setw(12)  << currTS << " (" << setw(6) << setprecision(2) << std::fixed << (double)currTS/(double)NrTS*100.0  << "%)" ;
 			cout << " with currently " << setw(6) << setprecision(1) << std::fixed << speed*(double)(currTS-prevTS)/t_diff << " MCells/s" ;
-			cout << " --- Energy: ~" << setw(6) << setprecision(2) << std::scientific << currE << " (decrement: " << setw(6)  << setprecision(2) << std::fixed << fabs(10.0*log10(currE/maxE)) << "dB)" << endl;
+			if (maxE)
+				change = currE/maxE;
+			cout << " --- Energy: ~" << setw(6) << setprecision(2) << std::scientific << currE << " (decrement: " << setw(6)  << setprecision(2) << std::fixed << fabs(10.0*log10(change)) << "dB)" << endl;
 			prevTime=currTime;
 			prevTS=currTS;
 		}