Excuse me for replying to myself...
It turns out that I had not updated the comments.php on my customized theme to the newer version. I have now fixed it, using the current wp classic comments.php as a template.
However, the trackbacks are STILL not showing up. Could this be because I have the gatekeeper plugin installed? I have placed the gatekeeper coding between the textarea and the submit comment button on the comment form:
<p><?php do_action('comment_form', $post->ID); ?>
<textarea name="comment" id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>
<?php gatekeeper_pose_challenge(); ?>
<p><input name="submit" type="submit" id="submit" tabindex="5" value="<?php esc_attr_e('Submit Comment'); ?>" />
<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />
</p>
Is the gatekeeper challenge causing the trackbacks and pingbacks to fail?
Thank you for any help.
-E Morris wp2.8.6