Maximize button-tooltips doesn't disappear after clicked

[cheebee9]

Hi,

when I move the mouse pointer to a window's 'maximize' button, and waiting for the tooltip ("Maximize window") show, a "Close window" tooltip gets up after I clicked on the 'maximize' button immediately, and I can't remove it from the screen anymore.

The only way to remove it, I need to size back the window, and move the pointer again to the buttons to show up a tooltip again.

Configuration:
Ubuntu 12.04 beta 1

Intel® Core 2 Duo E4500
Intel® G965 / ICH8 Chipset
Intel® GMA X3000

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: metacity 1:2.34.1-1ubuntu7
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
ApportVersion: 1.94-0ubuntu2
Architecture: i386
Date: Wed Mar 7 18:02:40 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
ProcEnviron:
 TERM=xterm
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: metacity
UpgradeStatus: Upgraded to precise on 2012-03-07 (0 days ago)

[cheebee9 (cheebee9-deactivatedaccount)]

I can't get rid of this (see attachment), only if I move the mouse again to the buttons, to generate a tooltip again.