diff --git a/cura/ExtruderManager.py b/cura/ExtruderManager.py
index b2c3b47e8e..df31cbacdf 100644
--- a/cura/ExtruderManager.py
+++ b/cura/ExtruderManager.py
@@ -4,7 +4,7 @@
 from PyQt5.QtCore import pyqtSignal, pyqtProperty, pyqtSlot, QObject #For communicating data and events to Qt.
 
 import UM.Application #To get the global container stack to find the current machine.
-from UM.Logger import Logger
+import UM.Logger
 import UM.Settings.ContainerRegistry #Finding containers by ID.
 
 
@@ -65,15 +65,12 @@ class ExtruderManager(QObject):
             return
 
         #Add the extruder trains that don't exist yet.
-        for position, extruder_definition_id in machine_definition.getMetaDataEntry("machine_extruder_trains", default = {}).items():
-            extruder_definition = container_registry.findDefinitionContainers(machine = machine_definition.getId())
-            if extruder_definition:
-                extruder_definition = extruder_definition[0]
-            else:
-                Logger.log("w", "Machine %s references an extruder with ID %s, which doesn't exist.", machine_definition.getName(), extruder_definition_id)
-                continue
-            name = container_registry.uniqueName(extruder_definition_id) #Make a name based on the ID of the definition.
-            if not container_registry.findContainerStacks(id = name): #Doesn't exist yet.
+        for extruder_definition in container_registry.findDefinitionContainers(machine = machine_definition.getId()):
+            position = extruder_definition.getMetaDataEntry("position", None)
+            if not position:
+                UM.Logger.Log("w", "Extruder definition %s specifies no position metadata entry.", extruder_definition.getId())
+            if not container_registry.findContainerStacks(machine = machine_id, position = position): #Doesn't exist yet.
+                name = container_registry.uniqueName(extruder_definition.getId()) #Make a name based on the ID of the definition.
                 self.createExtruderTrain(extruder_definition, machine_definition, name, position)
 
         #Gets the extruder trains that we just created as well as any that still existed.
diff --git a/cura/SettingOverrideDecorator.py b/cura/SettingOverrideDecorator.py
index e212d93dac..f9878e436c 100644
--- a/cura/SettingOverrideDecorator.py
+++ b/cura/SettingOverrideDecorator.py
@@ -7,7 +7,7 @@ from UM.Settings.InstanceContainer import InstanceContainer
 from UM.Settings.ContainerRegistry import ContainerRegistry
 
 from UM.Application import Application
-
+import copy
 ##  A decorator that adds a container stack to a Node. This stack should be queried for all settings regarding
 #   the linked node. The Stack in question will refer to the global stack (so that settings that are not defined by
 #   this stack still resolve.
@@ -15,6 +15,7 @@ class SettingOverrideDecorator(SceneNodeDecorator):
     def __init__(self):
         super().__init__()
         self._stack = ContainerStack(stack_id = id(self))
+        self._stack.setDirty(False)  # This stack does not need to be saved.
         self._instance = InstanceContainer(container_id = "SettingOverrideInstanceContainer")
         self._stack.addContainer(self._instance)
 
@@ -25,6 +26,15 @@ class SettingOverrideDecorator(SceneNodeDecorator):
         Application.getInstance().globalContainerStackChanged.connect(self._onGlobalContainerStackChanged)
         self._onGlobalContainerStackChanged()
 
+    def __deepcopy__(self, memo):
+        ## Create a fresh decorator object
+        deep_copy = SettingOverrideDecorator()
+        ## Copy the instance
+        deep_copy._instance = copy.deepcopy(self._instance, memo)
+        ## Set the copied instance as the first (and only) instance container of the stack.
+        deep_copy._stack.replaceContainer(0, deep_copy._instance)
+        return deep_copy
+
     def _onSettingChanged(self, instance, property):
         if property == "value":  # Only reslice if the value has changed.
             Application.getInstance().getBackend().forceSlice()
diff --git a/plugins/PerObjectSettingsTool/PerObjectSettingsPanel.qml b/plugins/PerObjectSettingsTool/PerObjectSettingsPanel.qml
index c89485517e..9565b0e345 100644
--- a/plugins/PerObjectSettingsTool/PerObjectSettingsPanel.qml
+++ b/plugins/PerObjectSettingsTool/PerObjectSettingsPanel.qml
@@ -120,7 +120,7 @@ Item {
 
                     containerStackId: UM.ActiveTool.properties.getValue("ContainerID")
                     key: model.key
-                    watchedProperties: [ "value", "enabled", "state", "validationState" ]
+                    watchedProperties: [ "value", "enabled", "validationState" ]
                     storeIndex: 0
                 }
             }