And sorry about your post. We've had these timeout problems before with htmlpurifier, but usually that's only when there's been a lot of markup in the html (see https://bugs.launchpad.net/mahara/+bug/547773)
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Note: I created a new post as my earlier appears inaccessible: "Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/mahara-site-mahara-org/lib/htmlpurifier/HTMLPurifier/Strategy/MakeWellFormed.php on line 438"
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