1. It is reproducible, but it doesn't happen very often, so there are no 100% 
reproducible steps that I've found.
2. When the bug occurs, it's usually when I'm logging on and off, either with 
one user, or with multiple accounts.  For example, just yesterday, the bug 
occurred again when setting up a guest account on my laptop.  After I tested 
the guest account, I logged back in as my primary user, and saw what appeared 
to be two volume control icons in my system tray (instead of one volume control 
and one network manager icon).

Here, I have to correct two statements in my initial report.
1) I had initially stated, "I can still click on the area where the icon should 
be, and it behaves normally."  Well, when the bug occured yesterday, I realized 
that was not true.
2) I had initially stated, "The rightmost taskbar icon fails to display 
correctly (it appears to be displaying a bit of graphics from the element to 
its left)."  When the bug occurred yesterday, the corrupted networkmanager icon 
was to the left of the volume control, but assumed the appearance of the volume 
control.

So, it appears that the problem may not be with the panel after all, but with 
the network manager.  As of now, here is my best guess as to what is happening:
1) Somehow the network manager is becoming unresponsive.
2) When the network manager's tray icon is to be drawn, the network manager 
never draws its icon, leaving whatever was previously in that place graphically 
still on the screen.

I realize that this bug report isn't very good, and I apologize.  I had
too many assumptions in my initial report (and possibly in this one as
well).

-- 
taskbar icons corrupted after logging out and back in
https://bugs.launchpad.net/bugs/469818
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is a bug assignee.

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