diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index ea3ca30118..89fa5e3e88 100644
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -71,7 +71,7 @@ class ThreeMFReader(MeshReader):
                 rotation.setByRotationAxis(-0.5 * math.pi, Vector(1, 0, 0))
 
                 # TODO: We currently do not check for normals and simply recalculate them.
-                mesh_builder.calculateNormals()
+                mesh_builder.calculateNormals(flip = True)
                 mesh_builder.setFileName(file_name)
                 node.setMeshData(mesh_builder.build().getTransformed(rotation))
                 node.setSelectable(True)
diff --git a/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py b/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
index 5c52c89416..953f60a33d 100644
--- a/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
+++ b/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
@@ -77,7 +77,10 @@ class PerObjectSettingsTool(Tool):
             if not self._multi_extrusion:
                 default_stack_id = global_container_stack.getId()
             else:
-                default_stack_id = ExtruderManager.getInstance().getExtruderStack(0).getId()
+                default_stack = ExtruderManager.getInstance().getExtruderStack(0)
+                if default_stack:
+                    default_stack_id = default_stack.getId()
+                else: default_stack_id = global_container_stack.getId()
 
             root_node = Application.getInstance().getController().getScene().getRoot()
             for node in DepthFirstIterator(root_node):
diff --git a/plugins/SolidView/SolidView.py b/plugins/SolidView/SolidView.py
index 2d017f829f..fd9f106334 100644
--- a/plugins/SolidView/SolidView.py
+++ b/plugins/SolidView/SolidView.py
@@ -51,6 +51,8 @@ class SolidView(View):
             if multi_extrusion:
                 support_extruder_nr = global_container_stack.getProperty("support_extruder_nr", "value")
                 support_angle_stack = ExtruderManager.getInstance().getExtruderStack(support_extruder_nr)
+                if not support_angle_stack:
+                    support_angle_stack = global_container_stack
             else:
                 support_angle_stack = global_container_stack
 
diff --git a/resources/qml/Settings/SettingItem.qml b/resources/qml/Settings/SettingItem.qml
index ed16b722dd..cdc557a089 100644
--- a/resources/qml/Settings/SettingItem.qml
+++ b/resources/qml/Settings/SettingItem.qml
@@ -138,7 +138,7 @@ Item {
             {
                 id: linkedSettingIcon;
 
-                visible: Cura.MachineManager.activeStackId != Cura.MachineManager.activeMachineId && !definition.settable_per_extruder && base.showLinkedSettingIcon
+                visible: Cura.MachineManager.activeStackId != Cura.MachineManager.activeMachineId && (!definition.settable_per_extruder || definition.global_inherits_stack != "-1") && base.showLinkedSettingIcon
 
                 height: parent.height;
                 width: height;