u1 music store webapp not correctly matched to icon in the launcher

[Olivier Tilloy]

With today’s batch of updates for quantal, two new icons appeared in my launcher (ubuntu one music store, and amazon).
When I clicked on the ubuntu one music store icon, https://one.ubuntu.com/music-store/ opened up in a new tab in my browser, but instead of associating it to the existing icon in the launcher (the one I clicked), a new tile appeared, fully grey, and when hovered with the mouse the tooltip says "UbuntuOneMusicStore".

See attached screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity-webapps-common 2.4.6-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
Uname: Linux 3.5.0-15-generic i686
NonfreeKernelModules: nvidia wl
ApportVersion: 2.5.2-0ubuntu4
Architecture: i386
CheckboxSubmission: 2c7995ffdf051a6d0adf7ab2c7be5ba9
CheckboxSystem: 7e42599bda39ea7ff8b528272b6ef52b
Date: Tue Sep 25 09:30:53 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
PackageArchitecture: all
SourcePackage: webapps-applications
UpgradeStatus: Upgraded to quantal on 2012-08-30 (25 days ago)