diff --git a/plugins/3MFWriter/ThreeMFWorkspaceWriter.py b/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
index 0a915d610e..aaa590cbaf 100644
--- a/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
+++ b/plugins/3MFWriter/ThreeMFWorkspaceWriter.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Cura is released under the terms of the AGPLv3 or higher.
+
 from UM.Workspace.WorkspaceWriter import WorkspaceWriter
 from UM.Application import Application
 from UM.Preferences import Preferences
@@ -42,9 +45,14 @@ class ThreeMFWorkspaceWriter(WorkspaceWriter):
                 self._writeContainerToArchive(container, archive)
 
         # Write preferences to archive
-        preferences_file = zipfile.ZipInfo("Cura/preferences.cfg")
+        original_preferences = Preferences.getInstance() #Copy only the preferences that we use to the workspace.
+        temp_preferences = Preferences()
+        for preference in {"general/visible_settings", "cura/active_mode", "cura/categories_expanded"}:
+            temp_preferences.addPreference(preference, None)
+            temp_preferences.setValue(preference, original_preferences.getValue(preference))
         preferences_string = StringIO()
-        Preferences.getInstance().writeToFile(preferences_string)
+        temp_preferences.writeToFile(preferences_string)
+        preferences_file = zipfile.ZipInfo("Cura/preferences.cfg")
         archive.writestr(preferences_file, preferences_string.getvalue())
 
         # Save Cura version
diff --git a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
index 1fbe50873e..302abc330a 100644
--- a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
+++ b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
@@ -47,7 +47,7 @@ class ProcessSlicedLayersJob(Job):
         super().__init__()
         self._layers = layers
         self._scene = Application.getInstance().getController().getScene()
-        self._progress = None
+        self._progress_message = Message(catalog.i18nc("@info:status", "Processing Layers"), 0, False, -1)
         self._abort_requested = False
 
     ##  Aborts the processing of layers.
@@ -62,12 +62,11 @@ class ProcessSlicedLayersJob(Job):
     def run(self):
         start_time = time()
         if Application.getInstance().getController().getActiveView().getPluginId() == "LayerView":
-            self._progress = Message(catalog.i18nc("@info:status", "Processing Layers"), 0, False, -1)
-            self._progress.show()
+            self._progress_message.show()
             Job.yieldThread()
             if self._abort_requested:
-                if self._progress:
-                    self._progress.hide()
+                if self._progress_message:
+                    self._progress_message.hide()
                 return
 
         Application.getInstance().getController().activeViewChanged.connect(self._onActiveViewChanged)
@@ -80,8 +79,8 @@ class ProcessSlicedLayersJob(Job):
                 node.getParent().removeChild(node)
                 break
             if self._abort_requested:
-                if self._progress:
-                    self._progress.hide()
+                if self._progress_message:
+                    self._progress_message.hide()
                 return
 
         # Force garbage collection.
@@ -159,11 +158,11 @@ class ProcessSlicedLayersJob(Job):
             # This needs some work in LayerData so we can add the new layers instead of recreating the entire mesh.
 
             if self._abort_requested:
-                if self._progress:
-                    self._progress.hide()
+                if self._progress_message:
+                    self._progress_message.hide()
                 return
-            if self._progress:
-                self._progress.setProgress(progress)
+            if self._progress_message:
+                self._progress_message.setProgress(progress)
 
         # We are done processing all the layers we got from the engine, now create a mesh out of the data
 
@@ -197,8 +196,8 @@ class ProcessSlicedLayersJob(Job):
         layer_mesh = layer_data.build(material_color_map, line_type_brightness)
 
         if self._abort_requested:
-            if self._progress:
-                self._progress.hide()
+            if self._progress_message:
+                self._progress_message.hide()
             return
 
         # Add LayerDataDecorator to scene node to indicate that the node has layer data
@@ -216,15 +215,15 @@ class ProcessSlicedLayersJob(Job):
         if not settings.getProperty("machine_center_is_zero", "value"):
             new_node.setPosition(Vector(-settings.getProperty("machine_width", "value") / 2, 0.0, settings.getProperty("machine_depth", "value") / 2))
 
-        if self._progress:
-            self._progress.setProgress(100)
+        if self._progress_message:
+            self._progress_message.setProgress(100)
 
         view = Application.getInstance().getController().getActiveView()
         if view.getPluginId() == "LayerView":
             view.resetLayerData()
 
-        if self._progress:
-            self._progress.hide()
+        if self._progress_message:
+            self._progress_message.hide()
 
         # Clear the unparsed layers. This saves us a bunch of memory if the Job does not get destroyed.
         self._layers = None
@@ -234,10 +233,10 @@ class ProcessSlicedLayersJob(Job):
     def _onActiveViewChanged(self):
         if self.isRunning():
             if Application.getInstance().getController().getActiveView().getPluginId() == "LayerView":
-                if not self._progress:
-                    self._progress = Message(catalog.i18nc("@info:status", "Processing Layers"), 0, False, 0, catalog.i18nc("@info:title", "Information"))
-                if self._progress.getProgress() != 100:
-                    self._progress.show()
+                if not self._progress_message:
+                    self._progress_message = Message(catalog.i18nc("@info:status", "Processing Layers"), 0, False, 0, catalog.i18nc("@info:title", "Information"))
+                if self._progress_message.getProgress() != 100:
+                    self._progress_message.show()
             else:
-                if self._progress:
-                    self._progress.hide()
+                if self._progress_message:
+                    self._progress_message.hide()