Yeah, it's still in 3.5.10. In fact, I mistakenly thought it to be
related to the kicker-taskbar-compiz, because I do use compiz. see link:

https://bugs.launchpad.net/ubuntu/+source/kicker-taskbar-
compiz/+bug/261694

But it isn't. I have done some layman research and these are my
conclusions:

1. When I have Autohide disabled in the taskbar settings, the problem doesn't 
occur. Ever. 
2. When I lock and unlock the panel, the leftovers disappear, but it
start again after i close a window or two.
3. It doesn't happen for all windows, but I couldn't find out any
predictability in which are and which are not influenced.
4. When a window is closed, all items to the right of that window slide one 
position to the left. The former location of the rightmost window doesn't get 
overwritten, so it stays visible. 
5. If I close a window by rightclicking it on the taskbar and then choosing 
close, the problem also doesn't occur. But I haven't tried it often enough to 
say "Ever" like in 1. 

Conclusion:
So it seems to me that the redraw event doens't take place when the taskbar is 
hidden while closing a window. 

I hope this can be resolved.

-- 
In Kubuntu Hardy, closed applications remain on the Taskbar
https://bugs.launchpad.net/bugs/239645
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