Index: trunk/HeuristicLab.Optimization/3.3/Problems/Problem.cs
===================================================================
--- trunk/HeuristicLab.Optimization/3.3/Problems/Problem.cs	(revision 16796)
+++ trunk/HeuristicLab.Optimization/3.3/Problems/Problem.cs	(revision 16875)
@@ -23,4 +23,5 @@
 using System.Collections.Generic;
 using System.Drawing;
+using HEAL.Attic;
 using HeuristicLab.Collections;
 using HeuristicLab.Common;
@@ -28,5 +29,4 @@
 using HeuristicLab.Data;
 using HeuristicLab.Parameters;
-using HEAL.Attic;
 
 namespace HeuristicLab.Optimization {
@@ -52,5 +52,5 @@
     protected Problem()
       : base() {
-      Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>(), false));
+      Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>()) { GetsCollected = false });
       OperatorsParameter.Hidden = true;
       RegisterEventHandlers();
@@ -66,5 +66,5 @@
         if (operators != null) {
           Parameters.Remove(OperatorsParameterName);
-          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>(operators), false));
+          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>(operators)) { GetsCollected = false });
           OperatorsParameter.Hidden = true;
         }
@@ -95,5 +95,5 @@
         //necessary to convert old experiments files where no parameter was used for saving the operators
         if (!Parameters.ContainsKey(OperatorsParameterName)) {
-          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>(), false));
+          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>()) { GetsCollected = false });
           OperatorsParameter.Hidden = true;
         }
@@ -107,5 +107,5 @@
         #region Backwards compatible code, remove with 3.4
         if (!Parameters.ContainsKey(OperatorsParameterName)) {
-          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>(), false));
+          Parameters.Add(new FixedValueParameter<ItemCollection<IItem>>(OperatorsParameterName, "The operators and items that the problem provides to the algorithms.", new ItemCollection<IItem>()) { GetsCollected = false });
           OperatorsParameter.Hidden = true;
         }
Index: trunk/HeuristicLab.Optimization/3.3/Problems/UserDefinedProblem.cs
===================================================================
--- trunk/HeuristicLab.Optimization/3.3/Problems/UserDefinedProblem.cs	(revision 16796)
+++ trunk/HeuristicLab.Optimization/3.3/Problems/UserDefinedProblem.cs	(revision 16875)
@@ -25,4 +25,5 @@
 using System.Linq;
 using System.Threading;
+using HEAL.Attic;
 using HeuristicLab.Collections;
 using HeuristicLab.Common;
@@ -30,5 +31,4 @@
 using HeuristicLab.Data;
 using HeuristicLab.Parameters;
-using HEAL.Attic;
 using HeuristicLab.PluginInfrastructure;
 
@@ -130,5 +130,5 @@
         ItemList<IOperator> tmp = ((ValueParameter<ItemList<IOperator>>)Parameters["Operators"]).Value;
         Parameters.Remove("Operators");
-        Parameters.Add(new ValueParameter<ItemList<IItem>>("Operators", "The operators and items that the problem provides to the algorithms.", new ItemList<IItem>(tmp), false));
+        Parameters.Add(new ValueParameter<ItemList<IItem>>("Operators", "The operators and items that the problem provides to the algorithms.", new ItemList<IItem>(tmp)) { GetsCollected = false });
       }
       #endregion
