Xfce theme switching caused Xfce to crash and now it would not to start - any suggestions for reset or re-config to default

[Edmon Begoli]

Does anyone have a suggestion how to reset Xfce (ver. 4 of Fedora 12)
so it would start again.

I was switching themes to check them out and some setting cause Xfce
to crash, and now Xfce
is kicking me out to the login. I can only log in with Gnome or
command line interface.

Is there are a restore option, and if not where is the actual config.
file that I could use to
switch to the default theme. (I got to check which one is it first :-) )

Thank you,
Edmon