Appmenu was refusing to display a single menu of an app

See video for proof and demonstration. I had to restart the application to get the menu to show again.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: appmenu-gtk 0.3.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Mon Nov 28 13:37:37 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: appmenu-gtk
UpgradeStatus: Upgraded to oneiric on 2011-10-19 (39 days ago)