Application title bar occasionally black

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http://ubuntuforums.org – I started to experience this issue after updating GTK+3 to the version 3.3.20-0ubuntu1. Downgrading back to 3.3.18 solves the issue immediately. The issue is that the application title bar gets completely black, not always, but occasionally. I have seen this happen with NVidia proprietary drivers and with ATI open source drivers, plus both with xserver 1.11 and 1.12. I am using gnome-shell (3.3.90-0ubuntu1) and Adwaita theme. (Hardware)