I managed to narrow it down to Unity being the main cause of the issue. Compiz with Gnome Classic is not affected. The problem exists only when Unity plugin is active in Compiz.
** Also affects: unity (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to qt4-x11 in Ubuntu. https://bugs.launchpad.net/bugs/929712 Title: Missing context menus for Qt apps after minimizing the window To manage notifications about this bug go to: https://bugs.launchpad.net/compiz-core/+bug/929712/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs