Using GNOME 3.20 here. When trying to unlock a locker feature in gnome-control-center, I used to be required to enter a privileged user password.

In GNOME 3.20, I don't get the dialog. Also, previously, using pkexec to run a command would spawn an authentication dialog, but that doesn't work anymore either.

I see the following in my journal after trying to run a privileged action which should spawn the authentication agent:

 Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: (gnome-shell:681): Gjs-WARNING **: JS ERROR: Error: value is out of range for Argument 'timestamp' (type guint32)
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: pushModal@resource:///org/gnome/shell/ui/main.js:397
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: ModalDialog<.pushModal@resource:///org/gnome/shell/ui/modalDialog.js:322
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: ModalDialog<.open@resource:///org/gnome/shell/ui/modalDialog.js:262
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: AuthenticationDialog<._ensureOpen@resource:///org/gnome/shell/ui/components/polkitAgent.js:230
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: AuthenticationDialog<._onSessionRequest@resource:///org/gnome/shell/ui/components/polkitAgent.js:328
Apr 14 10:04:25 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:32 krejzi gnome-control-center.desktop[21081]: (gnome-control-center:21081): GLib-GIO-CRITICAL **: g_permission_acquire_finish: assertion 'G_IS_PERMISSION (permission)' failed
Apr 14 10:04:32 krejzi kernel: gnome-control-c[21081]: segfault at 8 ip 00007f2b310e0c4b sp 00007ffcd2e1d280 error 4 in libgtk-3.so.0.2000.2[7f2b30e47000+708000]
Apr 14 10:04:32 krejzi polkitd[399]: Operator of unix-session:c2 FAILED to authenticate to gain authorization for action org.gnome.controlcenter.datetime.configure for unix-process:21081:155137 [gnome-control-center --overview] (owned by unix-user:armin)
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: (gnome-shell:681): Gjs-WARNING **: JS ERROR: Error: value is out of range for Argument 'timestamp' (type guint32)
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: pushModal@resource:///org/gnome/shell/ui/main.js:397
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: ModalDialog<.pushModal@resource:///org/gnome/shell/ui/modalDialog.js:322
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: ModalDialog<.open@resource:///org/gnome/shell/ui/modalDialog.js:262
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: AuthenticationDialog<._ensureOpen@resource:///org/gnome/shell/ui/components/polkitAgent.js:230
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: AuthenticationDialog<._onSessionRequest@resource:///org/gnome/shell/ui/components/polkitAgent.js:328
Apr 14 10:04:32 krejzi org.gnome.Shell.desktop[681]: wrapper@resource:///org/gnome/gjs/modules/lang.js:178