I'm still testing my site. I Installed the new plug in and everything seems to work fine. My page validates as XHTML before I added a picture with the Thumb in Post plugin. But after using it, the page doesn't validate as XHTML. I get a few errors. If you want to see go to http://www.triplethreats.net/blog/wordpress/index.php and then click the validate link at the lower right. Is there something wrong in your code or should I do something else?