When I install GTK+ theme, I got these black parts on windows:
I've tried different GTK+ themes, even default Adwaita has the same problem. When choosing Ambiance or Radiance - it works fine.
I'm using Ubuntu 15.04, and Gnome 3.14.
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First, make sure the needed GTK engines are installed.
sudo apt-get install gtk2-engines-murrine
If that works after restarting the shell (Alt+F2 & r & Enter), great! Otherwise, disable the theme for now and continue.
You can then install it from source if needed to get the latest version:
Enable the theme again, and restart the shell with Alt+F2 & r & Enter.