diff --git a/src/eva2/optimization/modules/AbstractOptimizationParameters.java b/src/eva2/optimization/modules/AbstractOptimizationParameters.java
index 94a50f95..09137877 100644
--- a/src/eva2/optimization/modules/AbstractOptimizationParameters.java
+++ b/src/eva2/optimization/modules/AbstractOptimizationParameters.java
@@ -192,7 +192,7 @@ public abstract class AbstractOptimizationParameters implements InterfaceOptimiz
 
     private List<InterfaceAdditionalPopulationInformer> getInformerList() {
         LinkedList<InterfaceAdditionalPopulationInformer> ret = new LinkedList<>();
-        if (problem instanceof InterfaceAdditionalPopulationInformer) {
+        if (problem != null) {
             ret.add(problem);
         }
         if (optimizer instanceof InterfaceAdditionalPopulationInformer) {
diff --git a/src/eva2/optimization/modules/OptimizationParameters.java b/src/eva2/optimization/modules/OptimizationParameters.java
index 26d2b38a..cbca3d18 100644
--- a/src/eva2/optimization/modules/OptimizationParameters.java
+++ b/src/eva2/optimization/modules/OptimizationParameters.java
@@ -28,9 +28,8 @@ public class OptimizationParameters extends AbstractOptimizationParameters imple
 
     /**
      * Should be removed and replaced by a more solid
-     * serialization. (EvAScript?)
+     * serialization.
      *
-     * @deprecated
      * @return
      */
     public static OptimizationParameters getInstance() {
diff --git a/src/eva2/optimization/modules/Processor.java b/src/eva2/optimization/modules/Processor.java
index 35e17817..6b947ed1 100644
--- a/src/eva2/optimization/modules/Processor.java
+++ b/src/eva2/optimization/modules/Processor.java
@@ -187,7 +187,7 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
             LOGGER.log(Level.SEVERE, errMsg, e);
             try {
                 JOptionPane.showMessageDialog(null, StringTools.wrapLine(errMsg, 60, 0.2), "Error in Optimization", JOptionPane.ERROR_MESSAGE);
-            } catch (Exception | Error ex) {
+            } catch (Exception | Error ignored) {
             }
             //statistics.stopOptimizationPerformed(false);
             setOptimizationRunning(false); // normal finish
@@ -221,10 +221,13 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
             }
         }
 
-        optimizationParameters.getOptimizer().addPopulationChangedEventListener(this);
-
         runCounter = 0;
 
+        InterfaceTerminator terminator = this.optimizationParameters.getTerminator();
+        InterfaceOptimizer optimizer = this.optimizationParameters.getOptimizer();
+        InterfaceOptimizationProblem problem = this.optimizationParameters.getProblem();
+
+        optimizer.addPopulationChangedEventListener(this);
         /**
          * We keep the optimization running until it is aborted by the user or
          * the number of multiple runs has been reached.
@@ -233,16 +236,17 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
             LOGGER.info(String.format("Starting Optimization %d/%d", runCounter + 1, statistics.getStatisticsParameter().getMultiRuns()));
             statistics.startOptimizationPerformed(getInfoString(), runCounter, optimizationParameters, getInformerList());
 
-            this.optimizationParameters.getProblem().initializeProblem();
-            this.optimizationParameters.getOptimizer().setProblem(this.optimizationParameters.getProblem());
-            this.optimizationParameters.getTerminator().initialize(this.optimizationParameters.getProblem());
+            problem.initializeProblem();
+            optimizer.setProblem(problem);
+            terminator.initialize(problem);
+
             maybeInitParamCtrl(optimizationParameters);
             if (this.createInitialPopulations) {
-                this.optimizationParameters.getOptimizer().initialize();
+                optimizer.initialize();
             }
 
             if (optimizationStateListener != null) {
-                optimizationStateListener.updateProgress(getStatusPercent(optimizationParameters.getOptimizer().getPopulation(), runCounter, statistics.getStatisticsParameter().getMultiRuns()), null);
+                optimizationStateListener.updateProgress(getStatusPercent(optimizer.getPopulation(), runCounter, statistics.getStatisticsParameter().getMultiRuns()), null);
             }
 
             /**
@@ -253,23 +257,23 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
             do {
                 maybeUpdateParamCtrl(optimizationParameters);
 
-                this.optimizationParameters.getOptimizer().optimize();
-            } while (isOptimizationRunning() && !this.optimizationParameters.getTerminator().isTerminated(this.optimizationParameters.getOptimizer().getAllSolutions()));
+                optimizer.optimize();
+            } while (isOptimizationRunning() && !terminator.isTerminated(optimizer.getAllSolutions()));
 
             runCounter++;
             maybeFinishParamCtrl(optimizationParameters);
             userAborted = !isOptimizationRunning(); // stop is "normal" if opt wasnt set false by the user (and thus still true)
             //////////////// Default stats
-            statistics.stopOptimizationPerformed(!userAborted, optimizationParameters.getTerminator().lastTerminationMessage()); // stop is "normal" if opt wasnt set false by the user (and thus still true)
+            statistics.stopOptimizationPerformed(!userAborted, terminator.lastTerminationMessage()); // stop is "normal" if opt wasnt set false by the user (and thus still true)
 
             //////////////// PP or set results without further PP
             if (!userAborted) {
                 resultPop = performPostProcessing();
                 if (resultPop == null) { // post processing disabled, so use opt. solutions
-                    resultPop = optimizationParameters.getOptimizer().getAllSolutions().getSolutions();
+                    resultPop = optimizer.getAllSolutions().getSolutions();
                 }
             } else {
-                resultPop = optimizationParameters.getOptimizer().getAllSolutions().getSolutions();
+                resultPop = optimizer.getAllSolutions().getSolutions();
             }
             statistics.postProcessingPerformed(resultPop);
 
@@ -281,7 +285,7 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
         if (optimizationStateListener != null) {
             optimizationStateListener.updateProgress(0, null);
         }
-        optimizationParameters.getOptimizer().removePopulationChangedEventListener(this);
+        optimizer.removePopulationChangedEventListener(this);
         return resultPop;
     }
 
@@ -334,11 +338,10 @@ public class Processor extends Thread implements InterfaceProcessor, InterfacePo
             args = new Object[]{optimizer};
         }
 
-        if (args != null) { // only if iteration counting is available
-            iterateParamCtrl(optimizer, "updateParameters", args);
-            args[0] = goParams.getProblem();
-            iterateParamCtrl(goParams.getProblem(), "updateParameters", args);
-        }
+        // only if iteration counting is available
+        iterateParamCtrl(optimizer, "updateParameters", args);
+        args[0] = goParams.getProblem();
+        iterateParamCtrl(goParams.getProblem(), "updateParameters", args);
     }
 
     /**
diff --git a/src/eva2/optimization/statistics/InterfaceStatisticsParameters.java b/src/eva2/optimization/statistics/InterfaceStatisticsParameters.java
index fe94a46d..1d0d616c 100644
--- a/src/eva2/optimization/statistics/InterfaceStatisticsParameters.java
+++ b/src/eva2/optimization/statistics/InterfaceStatisticsParameters.java
@@ -17,9 +17,6 @@ public interface InterfaceStatisticsParameters {
 
     int getMultiRuns();
 
-    String multiRunsTipText();
-
-
     /**
      * Use averaged graph for multi-run plots or not.
      *
diff --git a/src/eva2/optimization/statistics/StatisticsParameters.java b/src/eva2/optimization/statistics/StatisticsParameters.java
index 179c8a57..94820b86 100644
--- a/src/eva2/optimization/statistics/StatisticsParameters.java
+++ b/src/eva2/optimization/statistics/StatisticsParameters.java
@@ -57,7 +57,7 @@ public class StatisticsParameters implements InterfaceStatisticsParameters, Inte
      */
     public static StatisticsParameters getInstance(boolean loadDefaultSerFile) {
         if (loadDefaultSerFile) {
-            return getInstance("Statistics.ser");
+            return getInstance("Statistics.yml");
         } else {
             return new StatisticsParameters();
         }
@@ -149,6 +149,7 @@ public class StatisticsParameters implements InterfaceStatisticsParameters, Inte
      *
      */
     @Override
+    @Parameter(name = "runs", description = "Number of independent optimization runs to evaluate.")
     public void setMultiRuns(int x) {
         multiRuns = x;
     }
@@ -161,14 +162,6 @@ public class StatisticsParameters implements InterfaceStatisticsParameters, Inte
         return multiRuns;
     }
 
-    /**
-     *
-     */
-    @Override
-    public String multiRunsTipText() {
-        return "Number of independent optimization runs to evaluate.";
-    }
-
     /**
      * Use averaged graph for multi-run plots or not
      */
@@ -181,14 +174,11 @@ public class StatisticsParameters implements InterfaceStatisticsParameters, Inte
      * Activate or deactivate averaged graph for multi-run plots
      */
     @Override
+    @Parameter(description = "Plotting each fitness graph separately if multiruns > 1.")
     public void setUseStatPlot(boolean x) {
         useStatPlot = x;
     }
 
-    public String useStatPlotTipText() {
-        return "Plotting each fitness graph separately if multiruns > 1.";
-    }
-
     /**
      *
      */