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The site effected tend to be wordpress blogs, with the sitemap generated by a recognised google xml sitemap plugin.
They worked fine before so confused why the change.
Has anyone else being effected by this
I logged in my webmaster tool and noticed the same message for a site of mine that has sitemap never modified for years.
I don't know what is going on; checked sitemap but it is OK.
Anybody else with this problem? Or even better: is this a problem?
Note: Discussion about Webmaster Tools errors continues here:
[edited by: tedster at 4:02 am (utc) on June 26, 2008]