Software center gives no indication anything is happening after clicking the "Use this source" button

What happens:
1. I find the "weather indicator" application in the USC and click on "More Information".
2. I see that I need to enable the "Universe" source in order to install it.
3. I click the "Use this source" button in the USC.
4. The button greys out, but nothing else appears to happen.
5. I can click the back arrow, then click "More infor" again, and the "Use this source" button is no longer grayed out.

What should happen:
1. I find the "weather indicator" application in the USC and click on "More Information".
2. I see that I need to enable the "Universe" source in order to install it.
3. I click the "Use this source" button in the USC.
4. The button greys out, a progress indicator appears like when installing an application, and an item is added to the "Progress" icon, which appears in the top bar.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: software-center 5.2.6
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu15
Architecture: amd64
Date: Sat Dec 15 21:10:24 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)