Since upgrading to 3.0 comments/comment form no longer appear. It seems that <?php comments_template(); ?> results in the following:
Warning: require(wp-includes/theme-compat/comments.php) [function.require]: failed to open stream: No such file or directory in /home/pixnik/public_html/wordpress/wp-includes/comment-template.php on line 893
Warning: require(wp-includes/theme-compat/comments.php) [function.require]: failed to open stream: No such file or directory in /home/pixnik/public_html/wordpress/wp-includes/comment-template.php on line 893
Fatal error: require() [function.require]: Failed opening required 'wp-includes/theme-compat/comments.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/pixnik/public_html/wordpress/wp-includes/comment-template.php on line 893
The path wp-includes/theme-compat/comments.php is valid. I do not understand the (include_path='.:/usr/lib/php:/usr/local/lib/php') in the fatal error message.
Any ideas how to resolve this please?