Actually the file MooPi gave contains the information for your Gtk+ theme, not your xfwm window manager theme. Edit the following file instead:
Code:
~/.config/xfce4/xfconf/xfce-perchannel-xml/xfwm4.xml
And find this line:
Code:
<property name="theme" type="string" value="Simian"/>
Where value is equal to the window theme you chose which broke everything. Change it to some safe theme which you have installed. I don't know which themes Xubuntu comes with as I'm using Fedora, but you can do:
Code:
ls -l /usr/share/themes/* | grep -B 3 xfwm
Which will list all of the themes you have installed which come with an xfwm theme. You can try "Xfce", "Sassandra", or "Redmond" which will probably be there.
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