Empty gnome-panel after choosing Radiance theme and restart

[.]

https://launchpad.net/ubuntu/+source/ubuntu-themes, downloaded
"13.04+13.10.20131014-0ubuntu1".

Hi,
after installing Radiance (put the Radiance folder into
/usr/share/themes), the panel is completely empty after restart.
See image. I'm using gnome-session-fallback. How to fix it?

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