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When I upgraded to WordPress 2.2 yesterday, I noticed my main index page was no longer validating with the W3C Markup Validation service. The rest of the WordPress and Archive Pages were validating just fine. I realized the errors were related to the code in “post.php.”

I scoured the WordPress Support pages and came across this entry. It’s a quick fix. All you have to do is comment out the trackback code that’s generating a slew of errors.