qtcreator is not shownig menu->"Build" on mouse click

For the full ticket please look at launchpad:

https://bugs.launchpad.net/ubuntu/+source/qtcreator/+bug/982964

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I am on Ubuntu12.04 updated to 15.4.2012.

qtcreator2.4.1 has a little bug in the menu bar.

When I move the mouse direct to the menu -> "Build" without touching the other menu options beside "Build"("Edit" or "Debug") and clicking with the laft mouse button the options of menu -> "Build" schould be shown.

This does not happen.

Instead when I click first on "Edit" or "Debug" the options of this menu entries are shown to me. A moving from there without leaving the high of the menu bar to the "Build" menu the options of "Build" are then shown to me.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qtcreator 2.4.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu3
Architecture: amd64
Date: Mon Apr 16 12:50:26 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64+mac (20120328)
ProcEnviron:
PATH=(custom, no username)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: qtcreator
UpgradeStatus: No upgrade log present (probably fresh install)