diff --git a/gramps/cli/grampscli.py b/gramps/cli/grampscli.py
index 7c1ffa8b7..988e7898d 100644
--- a/gramps/cli/grampscli.py
+++ b/gramps/cli/grampscli.py
@@ -331,11 +331,11 @@ class CLIManager:
         recent_files(filename, name)
         self.file_loaded = True
 
-    def do_reg_plugins(self, dbstate, uistate):
+    def do_reg_plugins(self, dbstate, uistate, rescan=False):
         """
         Register the plugins at initialization time.
         """
-        self._pmgr.reg_plugins(PLUGINS_DIR, dbstate, uistate)
+        self._pmgr.reg_plugins(PLUGINS_DIR, dbstate, uistate, rescan=rescan)
         self._pmgr.reg_plugins(USER_PLUGINS, dbstate, uistate, load_on_reg=True)
 
 def startcli(errors, argparser):
diff --git a/gramps/gen/plug/_manager.py b/gramps/gen/plug/_manager.py
index 152b5862d..31f1b5d2f 100644
--- a/gramps/gen/plug/_manager.py
+++ b/gramps/gen/plug/_manager.py
@@ -104,7 +104,7 @@ class BasePluginManager:
         self.__scanned_dirs = []
 
     def reg_plugins(self, direct, dbstate=None, uistate=None,
-                    load_on_reg=False):
+                    load_on_reg=False, rescan=False):
         """
         Searches the specified directory, and registers python plugin that
         are being defined in gpr.py files.
@@ -112,6 +112,14 @@ class BasePluginManager:
         If a relationship calculator for env var LANG is present, it is
         immediately loaded so it is available for all.
         """
+        if rescan:
+            self.__import_plugins    = []
+            self.__export_plugins    = []
+            self.__docgen_plugins    = []
+            self.__docgen_names      = []
+            self.__scanned_dirs = []
+            self.__pgr._PluginRegister__plugindata = []
+            self.__pgr._PluginRegister__id_to_pdata = {}
         # if we've already scanned this directory or if the directory does not
         # exist, we are done.  Should only happen in tests.
 
@@ -300,6 +308,8 @@ class BasePluginManager:
         self.__import_plugins = []
         self.__export_plugins = []
         self.__docgen_plugins = []
+        self.__docgen_names = []
+
 
     def reload_plugins(self):
         """ Reload previously loaded plugins """
diff --git a/gramps/gui/configure.py b/gramps/gui/configure.py
index f3c6cc0e7..f9633382f 100644
--- a/gramps/gui/configure.py
+++ b/gramps/gui/configure.py
@@ -1421,7 +1421,10 @@ class GrampsPreferences(ConfigureDialog):
             return
 
         if len(addon_update_list) > 0:
-            PluginWindows.UpdateAddons(self.uistate, self.track, addon_update_list)
+            rescan = PluginWindows.UpdateAddons(self.uistate, self.track,
+                                                addon_update_list).rescan
+            self.uistate.viewmanager.do_reg_plugins(self.dbstate, self.uistate,
+                                                    rescan=rescan)
         else:
             check_types = config.get('behavior.check-for-addon-update-types')
             OkDialog(
@@ -1434,7 +1437,6 @@ class GrampsPreferences(ConfigureDialog):
         # Dead code for l10n
         _('new'), _('update')
 
-        self.uistate.viewmanager.do_reg_plugins(self.dbstate, self.uistate)
 
     def database_backend_changed(self, obj):
         the_list = obj.get_model()
diff --git a/gramps/gui/plug/_windows.py b/gramps/gui/plug/_windows.py
index bb03cd334..627e655f2 100644
--- a/gramps/gui/plug/_windows.py
+++ b/gramps/gui/plug/_windows.py
@@ -1082,6 +1082,7 @@ class UpdateAddons(ManagedWindow):
         self.set_window(glade.toplevel, None, None)
         self.window.set_title(self.title)
         self.setup_configs("interface.updateaddons", 750, 400)
+        self.rescan = False
 
         apply_button = glade.get_object('apply')
         cancel_button = glade.get_object('cancel')
@@ -1137,6 +1138,7 @@ class UpdateAddons(ManagedWindow):
             self.list.selection.select_iter(pos)
 
         self.show()
+        self.window.run()
 
     def build_menu_names(self, obj):
         return (self.title, " ")
@@ -1210,6 +1212,7 @@ class UpdateAddons(ManagedWindow):
                      ", ".join(errors),
                      parent=self.parent_window)
         if count:
+            self.rescan = True
             OkDialog(_("Done downloading and installing addons"),
                      # translators: leave all/any {...} untranslated
                      "%s %s" % (ngettext("{number_of} addon was installed.",
diff --git a/gramps/gui/viewmanager.py b/gramps/gui/viewmanager.py
index 18d7aa182..b2c202c41 100644
--- a/gramps/gui/viewmanager.py
+++ b/gramps/gui/viewmanager.py
@@ -344,8 +344,9 @@ class ViewManager(CLIManager):
         """
         Called when add-on updates are available.
         """
-        PluginWindows.UpdateAddons(self.uistate, [], addon_update_list)
-        self.do_reg_plugins(self.dbstate, self.uistate)
+        rescan = PluginWindows.UpdateAddons(self.uistate, [],
+                                            addon_update_list).rescan
+        self.do_reg_plugins(self.dbstate, self.uistate, rescan=rescan)
 
     def _errordialog(self, title, errormessage):
         """
@@ -727,14 +728,15 @@ class ViewManager(CLIManager):
         if not self.dbstate.is_open() and show_manager:
             self.__open_activate(None)
 
-    def do_reg_plugins(self, dbstate, uistate):
+    def do_reg_plugins(self, dbstate, uistate, rescan=False):
         """
         Register the plugins at initialization time. The plugin status window
         is opened on an error if the user has requested.
         """
         # registering plugins
         self.uistate.status_text(_('Registering plugins...'))
-        error = CLIManager.do_reg_plugins(self, dbstate, uistate)
+        error = CLIManager.do_reg_plugins(self, dbstate, uistate,
+                                          rescan=rescan)
 
         #  get to see if we need to open the plugin status window
         if error and config.get('behavior.pop-plugin-status'):