WPMU Dev SEO and Simple Sitemaps

Hello WP multisite friends,
At one time I had the WPMU Dev SEO plugin installed, but have deactivated, then deleted due to minor conflicts with my theme framework.

I installed the simple sitemaps for multisite which works fine for all sites on network, except the 2 sites on the network that I had began to configure with WPMU dev seo plugin.

I get this error instead of a sitemap:

Error loading stylesheet: A network error occurred loading an XSLT stylesheet:

I am sure to have removed the entire plug-in but must have missed something...
Any ideas on how to clear this error?

As stated simple sitemaps works fine on other sites on the network such as:

Your consideration is appreciated,