Hello,
We’d like to mention that Disqus v2.74 is not compatible with WordPress v2.9.2. Several pages in the admin stopped working after installing Disqus v2.74 because of a “PHP:Fatal error” reported in the logs.
PHP Fatal error: Call to undefined function get_user_meta() in /srv/www/site/blog.metronews.fr/blog/wp-content/plugins/disqus-comment-system/disqus.php on line 1502
The above error can be fixed by changing “get_user_meta()” call to “get_usermeta()” in line 1502 in disqus.php. Or the best alternative is to use Disqus v2.73 instead.
/Abhay
https://wordpress.org/plugins/disqus-comment-system/