I don't think this is much related to unity, since I experienced this also in older versions of ubuntu (this problem has always been there ihmo).
When the window is minimized, sometimes doesn't get mapped again, and this is not possible also using other window managers (or tool such as libwnck). ** Changed in: unity Status: Confirmed => Incomplete ** Changed in: unity (Ubuntu) Status: Confirmed => Incomplete ** Also affects: update-notifier (Ubuntu) Importance: Undecided Status: New ** No longer affects: unity ** Changed in: unity (Ubuntu) Status: Incomplete => Opinion ** Changed in: unity (Ubuntu) Status: Opinion => Invalid ** Also affects: compiz Importance: Undecided Status: New ** Also affects: compiz (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/1389573 Title: Update-notifier window invisible in utopic To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/1389573/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp