gnumeric gtk-theme error

I’m using openSUSE 12.2 with LXDE. I didn’t upgrade from 12.1, because I want to use grub2 and systemd.
I did a fresh install some 3 weeks ago, ever since >gnumeric< doesn’t start anymore.

I get a >Gtk-WARNING **: Theme parsing error: gtk-widgets.css:…< error.

I searched already and found that a gtk-theme is missing or doesn’t fit, but I don’t remember in detail my old installation.
I intended to uninstall gnumeric, delete the hidden config-files and reinstall, but I can’t find any .gnumeric in my home-partition.

Where are the config-files of gnumeric located?

Thanks in advance,
Dickfell