diff --git a/cura/Machines/VariantManager.py b/cura/Machines/VariantManager.py
index 9c8cff9efb..f6feb70e09 100644
--- a/cura/Machines/VariantManager.py
+++ b/cura/Machines/VariantManager.py
@@ -115,17 +115,24 @@ class VariantManager:
 
     #
     # Gets the default variant for the given machine definition.
+    # If the optional GlobalStack is given, the metadata information will be fetched from the GlobalStack instead of
+    # the DefinitionContainer. Because for machines such as UM2, you can enable Olsson Block, which will set
+    # "has_variants" to True in the GlobalStack. In those cases, we need to fetch metadata from the GlobalStack or
+    # it may not be correct.
     #
     def getDefaultVariantNode(self, machine_definition: "DefinitionContainer",
-                              variant_type: VariantType) -> Optional["ContainerNode"]:
+                              variant_type: "VariantType",
+                              global_stack: Optional["GlobalStack"] = None) -> Optional["ContainerNode"]:
         machine_definition_id = machine_definition.getId()
+        container_for_metadata_fetching = global_stack if global_stack is not None else machine_definition
+
         preferred_variant_name = None
         if variant_type == VariantType.BUILD_PLATE:
-            if parseBool(machine_definition.getMetaDataEntry("has_variant_buildplates", False)):
-                preferred_variant_name = machine_definition.getMetaDataEntry("preferred_variant_buildplate_name")
+            if parseBool(container_for_metadata_fetching.getMetaDataEntry("has_variant_buildplates", False)):
+                preferred_variant_name = container_for_metadata_fetching.getMetaDataEntry("preferred_variant_buildplate_name")
         else:
-            if parseBool(machine_definition.getMetaDataEntry("has_variants", False)):
-                preferred_variant_name = machine_definition.getMetaDataEntry("preferred_variant_name")
+            if parseBool(container_for_metadata_fetching.getMetaDataEntry("has_variants", False)):
+                preferred_variant_name = container_for_metadata_fetching.getMetaDataEntry("preferred_variant_name")
 
         node = None
         if preferred_variant_name:
diff --git a/cura/Settings/CuraStackBuilder.py b/cura/Settings/CuraStackBuilder.py
index 6374e6056c..58109d3a8d 100644
--- a/cura/Settings/CuraStackBuilder.py
+++ b/cura/Settings/CuraStackBuilder.py
@@ -114,7 +114,8 @@ class CuraStackBuilder:
 
         # get variant container for extruders
         extruder_variant_container = application.empty_variant_container
-        extruder_variant_node = variant_manager.getDefaultVariantNode(global_stack.definition, VariantType.NOZZLE)
+        extruder_variant_node = variant_manager.getDefaultVariantNode(global_stack.definition, VariantType.NOZZLE,
+                                                                      global_stack = global_stack)
         extruder_variant_name = None
         if extruder_variant_node:
             extruder_variant_container = extruder_variant_node.getContainer()
diff --git a/plugins/SimulationView/LayerSlider.qml b/plugins/SimulationView/LayerSlider.qml
index 841472a836..1552506969 100644
--- a/plugins/SimulationView/LayerSlider.qml
+++ b/plugins/SimulationView/LayerSlider.qml
@@ -234,6 +234,11 @@ Item
             UM.SimulationView.setCurrentLayer(value)
 
             var diff = (value - sliderRoot.maximumValue) / (sliderRoot.minimumValue - sliderRoot.maximumValue)
+            // In case there is only one layer, the diff value results in a NaN, so this is for catching this specific case
+            if (isNaN(diff))
+            {
+                diff = 0
+            }
             var newUpperYPosition = Math.round(diff * (sliderRoot.height - (2 * sliderRoot.handleSize + sliderRoot.minimumRangeHandleSize)))
             y = newUpperYPosition
 
@@ -339,6 +344,11 @@ Item
             UM.SimulationView.setMinimumLayer(value)
 
             var diff = (value - sliderRoot.maximumValue) / (sliderRoot.minimumValue - sliderRoot.maximumValue)
+            // In case there is only one layer, the diff value results in a NaN, so this is for catching this specific case
+            if (isNaN(diff))
+            {
+                diff = 0
+            }
             var newLowerYPosition = Math.round((sliderRoot.handleSize + sliderRoot.minimumRangeHandleSize) + diff * (sliderRoot.height - (2 * sliderRoot.handleSize + sliderRoot.minimumRangeHandleSize)))
             y = newLowerYPosition
 
diff --git a/plugins/SimulationView/SimulationView.py b/plugins/SimulationView/SimulationView.py
index 8d739654d4..8467dfe8b2 100644
--- a/plugins/SimulationView/SimulationView.py
+++ b/plugins/SimulationView/SimulationView.py
@@ -346,7 +346,7 @@ class SimulationView(View):
 
         self._old_max_layers = self._max_layers
         ## Recalculate num max layers
-        new_max_layers = 0
+        new_max_layers = -1
         for node in DepthFirstIterator(scene.getRoot()):
             layer_data = node.callDecoration("getLayerData")
             if not layer_data:
@@ -381,7 +381,7 @@ class SimulationView(View):
             if new_max_layers < layer_count:
                 new_max_layers = layer_count
 
-        if new_max_layers > 0 and new_max_layers != self._old_max_layers:
+        if new_max_layers >= 0 and new_max_layers != self._old_max_layers:
             self._max_layers = new_max_layers
 
             # The qt slider has a bit of weird behavior that if the maxvalue needs to be changed first
diff --git a/resources/definitions/ultimaker2.def.json b/resources/definitions/ultimaker2.def.json
index aa684946c2..a91d2332b0 100644
--- a/resources/definitions/ultimaker2.def.json
+++ b/resources/definitions/ultimaker2.def.json
@@ -14,6 +14,7 @@
         "platform_offset": [9, 0, 0],
         "has_materials": false,
         "has_machine_quality": true,
+        "preferred_variant_name": "0.4 mm",
         "exclude_materials": ["generic_hips", "generic_petg", "generic_bam", "ultimaker_bam", "generic_pva", "ultimaker_pva", "generic_tough_pla", "ultimaker_tough_pla_black", "ultimaker_tough_pla_green", "ultimaker_tough_pla_red", "ultimaker_tough_pla_white"],
         "first_start_actions": ["UM2UpgradeSelection"],
         "supported_actions":["UM2UpgradeSelection", "UpgradeFirmware"],