You have been subscribed to a public bug: When some apps are maximised, the apps' screen does not extend to the upper-right edge of the screen, other apps do. Easy way to duplicate this:
Move the top panel to the bottom, open an application and maximize it. Moving the mouse to the immediate top corner and clicking (to close) will either select the window immediately behind it, or the desktop. Bringing the frontmost window out of focus, or closing the other window. ** Affects: ubuntulooks (Ubuntu) Importance: Medium Status: Confirmed -- Dapper 'human' theme does not maximize windows properly without top panel https://bugs.launchpad.net/bugs/40197 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs