Just installed current F18 stable (roughly) with gnome-packagekit 3.6.0-2.fc18. It correctly notified me that updates were available shortly after first boot, and opened up gpk-update-viewer to install them (I'm not sure if that's actually what we want any more, but that's a whole other bug report). I was able to install the updates successfully. However, when it was done, gpk-update-viewer didn't go away - it was still running, still showing a list of 118 updates (though I think the package versions disappeared), and still showing an active 'Install Updates' button. Clicking on that pops up an 'Operation was cancelled' error message. to reproduce - just install current f18 from static media (not a netinst so you don't get all the updates as part of the install), log in to GNOME, wait for an update notification, click on it and install the updates, wait till the end, see what happens. not a blocker, I don't think, but bad polish.
I ran into the exact same problem. I can confirm that once the packages were installed, the package version (not the name or summary) disappears from the list.
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Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.