Unity2d Dash: typing name of application then pressing return does not launch application

12.04 Unity-2d

Steps to reproduce

1. tap Windows key
2. type an application name e.g. gedit or sudoku
3. application is first listed in the 'recent apps' line of the Unity-2d Dash home screen
4. Hit enter key
5. Application does not start

In Unity, steps 1 to 4 start the invoked application

In Unity2d, clicking on the icon starts the application

In Unity2d up until a few updates ago on 12.04, steps 1 to 4 started the application.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-2d 5.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.92-0ubuntu1
Architecture: amd64
Date: Wed Feb 22 21:05:00 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120128)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-2d
UpgradeStatus: No upgrade log present (probably fresh install)