Global menu disappears when Firefox window is minimized

[Narcissus]

Binary package hint: firefox

When Firefox is minimized once, the global menu disappears almost every time, showing nothing instead of the hidden title and the menu. Restarting Firefox temporarily solve the issue, until the window is minimized again.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox-globalmenu 4.0~rc2+build3+nobinonly-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic-pae 2.6.38
Uname: Linux 2.6.38-7-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Tue Apr 5 20:25:23 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)