I had SuperToo1 1.4.7 installed and was using it in the session. But closed it and used the Addon Manager to update to the 1.4.8 version. However, the 1.4.7 version continued to be reloaded. Like adding a new view mode, the new version was only available after restarting Gramps.
Maybe the Addon Manager needs to re-run the Plugin Registration after a successful addon update? (Which still would not allow views to update since the GUI has that data cached. And features using dialogs in the Windows menu would likewise be locked.)