"Install" button misbehaves in "ubuntu software center"

1. Go to opera.com, download the .deb
2. click on the downloaded file, "ubuntu software center" pops up
3. wait while it pops up, it's veeeeery slooooow and boring
4. click the install button
5. the installation process begins, it's boring, switch to some other window or have a cup of tea.
6. return to the "ubuntu software center" window; try to remember if you really did press the install button

What I expected to happen:
A clear indication that the package has been installed, e.g. the install button is grayed or "install" is changed to "uninstall"

What happens instead:
I see the original "install" button. NOT grayed.

BUT when I click that button the 2nd time, it becomes grayed. Unfortunately, it does not look like the software is already installed, it looks like the button did not work. (I had to check the applications menu to see it's really installed.)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: software-center 5.0.2
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sat Oct 29 21:04:13 2011
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)