The following works around the new code for locking the screen in GS 3.36.

Before:

1101        if (this._activitiesIndicator != null) {
1102            if (this._signalShow > 0)
1103                this._activitiesIndicator.container.disconnect(this._signalShow);
1104            this._activitiesIndicator.container.show();
1105        }

After:

1101        if (this._activitiesIndicator != null) {
1102            if (this._signalShow > 0)
1103                this._activitiesIndicator.container.disconnect(this._signalShow);
1104            if (Main.sessionMode.currentMode == 'user')
1105                this._activitiesIndicator.container.show();
1106        }


In direcory ~/.local/share/gnome-shell/extensions/activities-config@nls1729,
change line 1104 and add new line 1105 in extension.js as follows:

1104            this._activitiesIndicator.container.show();
----
1104            if (Main.sessionMode.currentMode == 'user')
1105                this._activitiesIndicator.container.show();

Please make the changes and let me know if all is well in a week or so.
If you prefer just to wait for a new version it is not a problem.

Thanks for posting the issue.