Dear Sir,
it looks like you have a plugin installed that prevents saving of SQL string used in the data source. Check if you have installed RS Firewall and if so add an exception for the sitemap component.
About the Mosets tree, if you have thousands of links the sitemap will results in too much time to complete, Mosets tree is a very resource intensive extension, thus follow my advice in the previous post using only categories for HTML sitemap and using precaching for XML.
Contact me at
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providing an admin account for on site help.
Regards,
John