diff --git a/src/calibre/gui2/dialogs/check_library.py b/src/calibre/gui2/dialogs/check_library.py
index d4265aaad1..1328d541fc 100644
--- a/src/calibre/gui2/dialogs/check_library.py
+++ b/src/calibre/gui2/dialogs/check_library.py
@@ -266,25 +266,25 @@ class CheckLibraryDialog(QDialog):
                 tl.setData(1, Qt.ItemDataRole.UserRole, self.is_fixable)
                 tl.setText(1, _('(fixable)'))
                 tl.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsUserCheckable)
-                tl.setCheckState(1, False)
+                tl.setCheckState(1, Qt.CheckState.Unchecked)
             else:
                 tl.setData(1, Qt.ItemDataRole.UserRole, self.is_deletable)
                 tl.setData(2, Qt.ItemDataRole.UserRole, self.is_deletable)
                 tl.setText(1, _('(deletable)'))
                 tl.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsUserCheckable)
-                tl.setCheckState(1, False)
+                tl.setCheckState(1, Qt.CheckState.Unchecked)
             if attr == 'extra_covers':
                 tl.setData(2, Qt.ItemDataRole.UserRole, self.is_deletable)
                 tl.setText(2, _('(deletable)'))
                 tl.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsUserCheckable)
-                tl.setCheckState(2, False)
+                tl.setCheckState(2, Qt.CheckState.Unchecked)
             self.top_level_items[attr] = tl
 
             for problem in list_:
                 it = Item()
                 if checkable:
                     it.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsUserCheckable)
-                    it.setCheckState(2, False)
+                    it.setCheckState(2, Qt.CheckState.Unchecked)
                     it.setData(2, Qt.ItemDataRole.UserRole, self.is_deletable)
                 else:
                     it.setFlags(Qt.ItemFlag.ItemIsEnabled)
@@ -318,6 +318,8 @@ class CheckLibraryDialog(QDialog):
 
     def item_changed(self, item, column):
         def set_delete_boxes(node, col, to_what):
+            if isinstance(to_what, bool):
+                to_what = Qt.CheckState.Checked if to_what else Qt.CheckState.Unchecked
             self.log.blockSignals(True)
             if col:
                 node.setCheckState(col, to_what)
@@ -357,7 +359,7 @@ class CheckLibraryDialog(QDialog):
                     set_delete_boxes(item, column, item.checkState(column))
                     if column == 2:
                         self.log.blockSignals(True)
-                        item.setCheckState(1, False)
+                        item.setCheckState(1, Qt.CheckState.Unchecked)
                         self.log.blockSignals(False)
             else:
                 item.setCheckState(column, Qt.CheckState.Unchecked)
diff --git a/src/calibre/gui2/library/views.py b/src/calibre/gui2/library/views.py
index 75b4fbacbd..c37b34d78e 100644
--- a/src/calibre/gui2/library/views.py
+++ b/src/calibre/gui2/library/views.py
@@ -1520,6 +1520,7 @@ class DeviceBooksView(BooksView):  # {{{
 
     def reverse_sort(self):
         h = self.horizontalHeader()
-        h.setSortIndicator(h.sortIndicatorSection(), 1 - int(h.sortIndicatorOrder()))
+        h.setSortIndicator(
+            h.sortIndicatorSection(), Qt.SortOrder.AscendingOrder if h.sortIndicatorOrder() == Qt.SortOrder.DescendingOrder else Qt.SortOrder.DescendingOrder)
 
 # }}}
diff --git a/src/calibre/gui2/store/search/search.py b/src/calibre/gui2/store/search/search.py
index b200ba2a0c..e5ccbd0090 100644
--- a/src/calibre/gui2/store/search/search.py
+++ b/src/calibre/gui2/store/search/search.py
@@ -253,7 +253,7 @@ class SearchDialog(QDialog, Ui_Dialog):
         self.config['store_splitter_state'] = bytearray(self.store_splitter.saveState())
         self.config['results_view_column_width'] = [self.results_view.columnWidth(i) for i in range(self.results_view.model().columnCount())]
         self.config['sort_col'] = self.results_view.model().sort_col
-        self.config['sort_order'] = self.results_view.model().sort_order
+        self.config['sort_order'] = self.results_view.model().sort_order.value
         self.config['open_external'] = self.open_external.isChecked()
 
         store_check = {}
@@ -288,8 +288,11 @@ class SearchDialog(QDialog, Ui_Dialog):
                     self.store_checks[n].setChecked(store_check[n])
 
         self.results_view.model().sort_col = self.config.get('sort_col', 2)
-        self.results_view.model().sort_order = self.config.get('sort_order', Qt.SortOrder.AscendingOrder)
-        self.results_view.header().setSortIndicator(self.results_view.model().sort_col, self.results_view.model().sort_order)
+        so = self.config.get('sort_order', Qt.SortOrder.AscendingOrder)
+        if isinstance(so, int):
+            so = Qt.SortOrder(so)
+        self.results_view.model().sort_order = so
+        self.results_view.header().setSortIndicator(self.results_view.model().sort_col, so)
 
     def load_settings(self):
         # Seconds