diff --git a/plugins/PostProcessingPlugin/Script.py b/plugins/PostProcessingPlugin/Script.py
index be661e08894..bdd57a06e00 100644
--- a/plugins/PostProcessingPlugin/Script.py
+++ b/plugins/PostProcessingPlugin/Script.py
@@ -122,7 +122,7 @@ def getValue(self, line: str, key: str, default = None) -> Any:
         if not key in line or (';' in line and line.find(key) > line.find(';')):
             return default
         sub_part = line[line.find(key) + 1:]
-        m = re.search('^-?[0-9]+\.?[0-9]*', sub_part)
+        m = re.search(r'^-?[0-9]+\.?[0-9]*', sub_part)
         if m is None:
             return default
         try:
diff --git a/plugins/PostProcessingPlugin/scripts/PauseAtHeight.py b/plugins/PostProcessingPlugin/scripts/PauseAtHeight.py
index f502678317a..43df7669623 100644
--- a/plugins/PostProcessingPlugin/scripts/PauseAtHeight.py
+++ b/plugins/PostProcessingPlugin/scripts/PauseAtHeight.py
@@ -338,7 +338,7 @@ def execute(self, data: List[str]) -> List[str]:
                     nbr_negative_layers += 1
 
                 #Track the latest printing temperature in order to resume at the correct temperature.
-                if re.match("T(\d*)", line):
+                if re.match(r"T(\d*)", line):
                     current_t = self.getValue(line, "T")
                 m = self.getValue(line, "M")
                 if m is not None and (m == 104 or m == 109) and self.getValue(line, "S") is not None:
diff --git a/plugins/UM3NetworkPrinting/src/ExportFileJob.py b/plugins/UM3NetworkPrinting/src/ExportFileJob.py
index ac3da657190..1ab493c7478 100644
--- a/plugins/UM3NetworkPrinting/src/ExportFileJob.py
+++ b/plugins/UM3NetworkPrinting/src/ExportFileJob.py
@@ -28,7 +28,7 @@ def __init__(self, file_handler: Optional[FileHandler], nodes: List[SceneNode],
 
         # Determine the filename.
         job_name = CuraApplication.getInstance().getPrintInformation().jobName
-        job_name = re.sub("[^\w\-. ()]", "-", job_name)
+        job_name = re.sub(r"[^\w\-. ()]", "-", job_name)
         extension = self._mesh_format_handler.preferred_format.get("extension", "")
         self.setFileName("{}.{}".format(job_name, extension))
 
diff --git a/resources/qml/ActionPanel/OutputProcessWidget.qml b/resources/qml/ActionPanel/OutputProcessWidget.qml
index 1303dc20a26..c609cd6ca51 100644
--- a/resources/qml/ActionPanel/OutputProcessWidget.qml
+++ b/resources/qml/ActionPanel/OutputProcessWidget.qml
@@ -10,7 +10,7 @@ import Cura 1.0 as Cura
 
 
 // This element contains all the elements the user needs to visualize the data
-// that is gather after the slicing process, such as printint time, material usage, ...
+// that is gather after the slicing process, such as printing time, material usage, ...
 // There are also two buttons: one to previsualize the output layers, and the other to
 // select what to do with it (such as print over network, save to file, ...)
 Column
diff --git a/resources/qml/Menus/RecentFilesMenu.qml b/resources/qml/Menus/RecentFilesMenu.qml
index 19ff6812198..93fddd0bf69 100644
--- a/resources/qml/Menus/RecentFilesMenu.qml
+++ b/resources/qml/Menus/RecentFilesMenu.qml
@@ -2,7 +2,7 @@
 // Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.2
-import QtQuick.Controls 2.1
+import QtQuick.Controls 2.15
 
 import UM 1.3 as UM
 import Cura 1.0 as Cura
@@ -30,6 +30,6 @@ Cura.Menu
             onTriggered: CuraApplication.readLocalFile(modelData)
         }
         onObjectAdded: (index, object) => menu.insertItem(index, object)
-        onObjectRemoved: (object) => menu.removeItem(object)
+        onObjectRemoved: (index, object) => menu.removeItem(object)
     }
 }
diff --git a/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml b/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
index 254ba477bf7..c1b36676c79 100644
--- a/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
+++ b/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
@@ -57,7 +57,9 @@ RecommendedSettingSection
                 settingName: "support_structure"
                 propertyRemoveUnusedValue: false
                 updateAllExtruders: false
-                defaultExtruderIndex: supportExtruderProvider.properties.value
+                defaultExtruderIndex: supportExtruderProvider.properties.value != undefined ?
+                    supportExtruderProvider.properties.value :
+                    Cura.ExtruderManager.activeExtruderIndex
             }
         },
         RecommendedSettingItem
@@ -92,7 +94,9 @@ RecommendedSettingSection
                 width: parent.width
                 settingName: "support_type"
                 updateAllExtruders: true
-                defaultExtruderIndex: supportExtruderProvider.properties.value
+                defaultExtruderIndex: supportExtruderProvider.properties.value != undefined ?
+                    supportExtruderProvider.properties.value :
+                    Cura.ExtruderManager.activeExtruderIndex
             }
         }
     ]
diff --git a/scripts/extract_changelog.py b/scripts/extract_changelog.py
index a1a0b251f0b..934b963e0a9 100644
--- a/scripts/extract_changelog.py
+++ b/scripts/extract_changelog.py
@@ -13,7 +13,7 @@
         args.version = args.version[:-2]
 
     start_token = f"[{args.version}]"
-    pattern_stop_log = "\[\d+(\.\d+){1,2}\]"
+    pattern_stop_log = r"\[\d+(\.\d+){1,2}\]"
     log_line = False
     first_chapter = True