Testing my blog after upgrading to the latest version of WordPress, I noticed that blank pages were being returned after posting comments. Some Googling and further testing revealed that the Akismet anti-spam plugin was at fault, although the reason for it (at the present time) remains a mystery.
I did find a solution, however, involving a [small modification to the comments.php file](http://www.smartbloggerz.com/2009/09/how-to-fix-wordpress-blank-page-error-on-leaving-comments/) in the theme.
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