If you have the System Preferences Security pane open, leave it (back < at top) and then back in (> at top). You should then see the allow dialog.That said, it seems best to reboot.I remove the application from /Applications, systemextensionsctl reset and reboot.Even then occasionally it won't load correctly.It helps if you have a separate development system and you can rsync the app into the test system for testing. Rebooting the test system is not as painful.