Found another bug report that seems to be the same - #45018. To add some more info, also in my case TwinView works in clone mode, and unlock window does not appear on any of connected monitors. And what's more important - some time ago everything worked ok (and no, I haven't changed anything in hardware/X config etc). But few days ago there was a massive upgrade of gnome/cups and other stuff. And It seems that after that problem appeared.
-- Unlock window does not appear https://launchpad.net/bugs/55277 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
