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When I switch windows on current Unity using Alt+Tab, I get an ugly outline of size of the selected window occasionally showing on random places. Is there a way to change this outline to something better looking or eliminate it altogether?

NB These outlines appear on Ubuntu Desktop without any effects enabled.

Outlined Firefox enter image description here

Outlined Nautilus enter image description here

Outlined Terminal enter image description here

Click on the images to better view the outlines in question.

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@Jorge, you removed the question being related to Unity... – Oxwivi Mar 6 '11 at 17:47
It's tagged unity and the unity developers are watching the tag so it'll be fine. :) – Jorge Castro Mar 6 '11 at 18:51
@Oxwivi Is it possible to grab a screenshot of what you're talking about? – Jorge Castro Mar 6 '11 at 19:00
@Jorge, it's unrelated to the one in development. And I don't know if I could grab a screen shot while pressing those two keys. – Oxwivi Mar 6 '11 at 19:01
You can do delayed screenshots. Run gnome-screenshot -i and select to grab the whole screen after a delay. This should give you time to create the strange lines. :) – htorque Mar 6 '11 at 19:03
up vote 4 down vote accepted

I can reproduce this in a normal GNOME session (without Compiz running). Unfortunately I don't think it's possible to disable those preview borders (I skimmed through Metacity's source code and couldn't find anything relevant).

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