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This image speaks for itself:

Picture of the issue

The white line between the window border and the window body is not supposed to be there. I've seen other users dealing with the same issue but I've never seen a solution posted. The problem remains whether the theme is placed in /usr/share/themes or ~/.themes. Thanks for your help!

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Is the theme a GTK 3 theme? – Uri Herrera Dec 20 '11 at 0:40
It is, it's called Elegant Revisited, it also comes with a Gnome Shell theme. I've been running it flawlessly on a previous Ubuntu install. – Tigull Dec 20 '11 at 8:14
up vote 2 down vote accepted

The white line appears because the text does not fit into the window border. Making the text smaller should fix it. You can do that by changing the widow title font size in gnome-tweak-tool.

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