XFCE Themes don't work

[chip]

I am using FreeBSD 7.0 Release and XFCE4.
I have downloaded and extracted some themes into 
/usr/local/share/themes/ and reset the permissions to 777, they do not 
appear on the themes list in the Settings control panel. I also copied 
them into ~./themes, reset the permissions and they still do not appear 
on the list. I do have the gtk-xfce-engine-2.4.2_1 installed.
What do I have to do to get these themes to appear on the themes list?