diff --git a/src/PamController/PamSettingManager.java b/src/PamController/PamSettingManager.java
index ddd15740..46bc0679 100644
--- a/src/PamController/PamSettingManager.java
+++ b/src/PamController/PamSettingManager.java
@@ -476,7 +476,7 @@ public class PamSettingManager {
 	 */
 	public PamSettings findSettingsOwner(String unitType, String unitName, String unitClassName) {
 		for (PamSettings owner:owners) {
-			if (owner.getClass() != null) {
+			if (owner.getClass() != null && unitClassName != null) {
 				if (owner.getClass().getName().equals(unitClassName) == false) {
 					continue;
 				}
diff --git a/src/PamController/UsedModuleInfo.java b/src/PamController/UsedModuleInfo.java
index 88756866..390ab1c0 100644
--- a/src/PamController/UsedModuleInfo.java
+++ b/src/PamController/UsedModuleInfo.java
@@ -58,4 +58,12 @@ public class UsedModuleInfo implements Serializable, ManagedParameters {
 		return ps;
 	}
 
+	/**
+	 * Get the unit name of the module being imported. 
+	 * @return
+	 */
+	public String getUnitName() {
+		return unitName;
+	}
+
 }
diff --git a/src/PamController/settings/SettingsImport.java b/src/PamController/settings/SettingsImport.java
index 0c52fb31..16e23f35 100644
--- a/src/PamController/settings/SettingsImport.java
+++ b/src/PamController/settings/SettingsImport.java
@@ -116,14 +116,16 @@ public class SettingsImport {
 	 */
 	private PamControlledUnit importReplace(SettingsImportGroup importGroup, String replaceModule) {
 		PamControlledUnitSettings mainSet = importGroup.getMainSettings();
-		PamControlledUnit unit = PamController.getInstance().findControlledUnit(mainSet.getUnitType(), replaceModule);
+		UsedModuleInfo importInfo = importGroup.getUsedModuleInfo();
+		PamControlledUnit unit = PamController.getInstance().findControlledUnit(importInfo.getUnitType(), replaceModule);
 		if (unit == null) {
-			System.out.println("Unable to find " + mainSet.getUnitType() + " " + mainSet.getUnitName() + " for settings replacement");
+			System.out.println("Unable to find " + importInfo.getUnitType() + " " + importInfo.getUnitName() + " for settings replacement");
 			return null; 
 		}
 		// check we can cast it to PamSettings
-		if (PamSettings.class.isAssignableFrom(unit.getClass())) {
+		if (PamSettings.class.isAssignableFrom(unit.getClass()) && mainSet != null) {
 			try {
+				mainSet.setUnitName(replaceModule);
 				((PamSettings) unit).restoreSettings(mainSet);
 			}
 			catch (Exception e) {
@@ -132,7 +134,7 @@ public class SettingsImport {
 				System.err.println(e.getMessage());
 			}
 		}
-		loadSubUnitSettings(importGroup, mainSet.getUnitName());
+		loadSubUnitSettings(importGroup, replaceModule);
 		return unit;
 	}
 
@@ -149,7 +151,15 @@ public class SettingsImport {
 		}
 		PamSettingManager setManager = PamSettingManager.getInstance();
 		for (PamControlledUnitSettings pamSettings:subSets) {
-			PamSettings owner = setManager.findSettingsOwner(pamSettings.getUnitType(), unitName, pamSettings.getOwnerClassName());
+			/*
+			 *  class name in pamSettings is no longer correct, so cannot use pamSettings.getOwnerClassName().
+			 *  but the classnames of all the sub modules are unknown (and will be different form the unit class name
+			 *  which can be got from importGroup.getPamModuleInfo().getClassName
+			 *  so will have to do this only on the unit type and name and hope for no conflicts (catch exception).  
+			 */
+//			PamModuleInfo moduleInfo = importGroup.getPamModuleInfo();
+//			String className = moduleInfo.getClassName();
+			PamSettings owner = setManager.findSettingsOwner(pamSettings.getUnitType(), unitName, null);
 			if (owner == null) {
 				System.out.println(String.format("Cannot find settings owner for %s %s in current model", pamSettings.getUnitType(), unitName));
 				continue;
@@ -168,7 +178,8 @@ public class SettingsImport {
 
 	private PamControlledUnit importNew(SettingsImportGroup importGroup) {
 		PamControlledUnitSettings mainSet = importGroup.getMainSettings();
-		String moduleName = mainSet.getUnitName();
+		UsedModuleInfo importInfo = importGroup.getUsedModuleInfo();
+		String moduleName = importInfo.unitName;
 
 		// check we've got a name that doesnt' exist and replace it if if does. 
 		//		int startChar = 0;
@@ -199,11 +210,11 @@ public class SettingsImport {
 		
 		PamControlledUnit unit = PamController.getInstance().addModule(PamController.getMainFrame(), moduleInfo);
 		if (unit == null) {
-			System.out.println("Unable to find " + mainSet.getUnitType() + " " + mainSet.getUnitName() + " for settings replacement");
+			System.out.println("Unable to find " + importInfo.getUnitType() + " " + importInfo.getUnitName() + " for settings replacement");
 			return null; 
 		}
 		// check we can cast it to PamSettings
-		if (PamSettings.class.isAssignableFrom(unit.getClass())) {
+		if (PamSettings.class.isAssignableFrom(unit.getClass()) && mainSet != null) {
 			try {
 				mainSet.setUnitName(unit.getUnitName()); // need to force the unit name for some modules. 
 				((PamSettings) unit).restoreSettings(mainSet);
diff --git a/src/PamController/settings/SettingsImportDialog.java b/src/PamController/settings/SettingsImportDialog.java
index 6f6621e6..4241a0cf 100644
--- a/src/PamController/settings/SettingsImportDialog.java
+++ b/src/PamController/settings/SettingsImportDialog.java
@@ -195,12 +195,14 @@ public class SettingsImportDialog extends PamDialog {
 		@Override
 		public Object getValueAt(int rowIndex, int columnIndex) {
 			SettingsImportGroup set = groupedSettings.get(rowIndex);
-			PamControlledUnitSettings mainSet = set.getMainSettings();
+//			PamControlledUnitSettings mainSet = set.getMainSettings();
 			switch (columnIndex) {
 			case 0:
-				return mainSet.getUnitType();
+				return set.getUsedModuleInfo().getUnitType();
+//				return mainSet.getUnitType();
 			case 1:
-				return mainSet.getUnitName();
+				return set.getUsedModuleInfo().unitName;
+//				return mainSet.getUnitName();
 			case 2:
 				//				return choiceBoxes[rowIndex].getSelectedItem().toString();
 				return set.getImportChoice().toString();
diff --git a/src/PamController/settings/SettingsImportGroup.java b/src/PamController/settings/SettingsImportGroup.java
index a74a6885..98bf1e4f 100644
--- a/src/PamController/settings/SettingsImportGroup.java
+++ b/src/PamController/settings/SettingsImportGroup.java
@@ -82,8 +82,10 @@ public class SettingsImportGroup {
 		try {
 			ownerClass = Class.forName(usedModuleInfo.className);
 		} catch (ClassNotFoundException e) {
+
+			System.out.println("Unknown class in loaded settings: " + usedModuleInfo.className);
 			// TODO Auto-generated catch block
-			e.printStackTrace();
+//			e.printStackTrace();
 		}
 		ArrayList<PamControlledUnit> existingModules = 
 				PamController.getInstance().findControlledUnits(ownerClass);