Category links using wrong directory stub

Love the plugin but although the monthly and individual post archives correctly link to the right place, it seems the category list is linking to an incorrect folder and I can’t work out how to change it.

Basically, my category archives are in:

/category/{categoryname}

but SAR is linking to:

/postcategory/{categoryname}

Where can I change this stub used?

For an example, check out:
http://www.nickpotter.net/archive

Thanks

http://wordpress.org/extend/plugins/smart-archives-reloaded/