Comment 11 for bug 989588

Timo, I see what you mean! :) I was able to reproduce what you're talking about.

Steps to reproduce, hastily written:

0. (create another user account)
1. login to my main account
2. lock screen
3. switch user
4. update package lists
5. switch back to main user

Update-manager window is shown in Launcher and Alt-Tab, but does not appear when selected, by either means.

Closing update-manager from the quicklist, and restarting, makes a visible window, as we've said. Also, starting the upgrade from the quicklist worked, and the in-progress dialog appeared normally. BUT, when the upgrade was done, and should return to the main window, that window was still inaccessible.

I guess I'll paste this into the main description.