I'm running 13.04 + Gnome Shell 3.8.1 (the same problem applies if I switch to Unity)
With apps that have the overlay scrollbars (eg Nautilus, Gedit) the overlay appears the first time I mouse over it and works fine, but then if I try it again it doesn't appear at all. Restarting the app resets it so that it works again the first time. Any ideas?
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