Bug#635056: I also have this problem

[Dominique Brazziel]

    Previously I think I had worked around it by using the Adwaita theme
instead of Clearlooks, which rendered the tabs with a diagonal line
on the left hand side and (I believe) highlighted the tab with the 
current focus but that no longer works and I have no idea 
which component changed to cause the failure.  The transition
to Gnome/GTK 3 seems to be breaking things along the way.
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