SEO/Sitemap Plugin and Domain Mapping not compatible?

I have installed the premium SEO/Sitemap plugin and also Supporter and the Domain Mapping plugin.

When I map a domain, the sitemap continues to create full path links with the subdomain instead.

should be: customdomain.com/page/
instead, i get: userblog.wpmuwebsite.com/page/

This creates errors indexing when the xml sitemap is submitted to search engines.

Is the seo/sitemap plugin just incompatible with domain mapping, or have I missed a configuration step somewhere?