Ok, I found a work-around. As you suggested, I turned off compiz in Gnome (System->Preferences->Appearance->Visual Effects->None) and now everything works as normal again. When I turn compiz on again ('Normal effects'), the apps go in 'true' full screen again.
-- Any KDE4 application started in GNOME becomes full screen https://bugs.launchpad.net/bugs/324232 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kde4libs in ubuntu. -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs