Software & Updates program won't open from the system settings menu

[Charles Ford]

Clicking the software & updates icon in the system settings control panel does absolutely nothing. It'll open from the unity launcher, though.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: software-properties-gtk 0.92.17
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic i686
ApportVersion: 2.9.2-0ubuntu5
Architecture: i386
Date: Sat Apr 6 20:33:43 2013
ExecutablePath: /usr/bin/software-properties-gtk
InstallationDate: Installed on 2013-04-06 (0 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20130402.1)
InterpreterPath: /usr/bin/python3.3
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)