Tryng to resize window in Appmenu area makes app menu beeing slided

Binary package hint: appmenu-gtk

Ubuntu 11.04 29-03-2011 daily prerelease build
See video. http://videobin.org/+42k/4f2.html
I make window resize using Alt+MiddleClick. It now works only while not maximized so only windowed.
When maximized appmenu slides away on left and tryng to resize using ALt+middle click in top left area where appmenu was makes middle click act as sliding on appmenu with middle click.
But sliding doesnt ends on releasing middle click somewhere in monitor centre.
I need to click middle again but now in appmenu.
Later resizing will work also on maximized window as it was previous versions so appmenu bug will be messing with it.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: appmenu-gtk 0.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
Architecture: i386
Date: Tue Mar 29 21:29:38 2011
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Beta 1 i386 (20110329.1)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: appmenu-gtk
UpgradeStatus: No upgrade log present (probably fresh install)