This was resolved with:
if(get_post_type() == 'Portfolio'){
echo '<a href="' . 'http://www.mysite.com/web-portfolio' . '">' . 'Portfolio'. '</a>' . $markup;
} else if(get_post_type() == 'Artwork'){
echo '<a href="' . 'http://www.mysite.com/art-portfolio' . '">' . 'Artwork' . '</a>' . $markup;
}
Solved this by updating the code in the single.php template with:
<?php comments_template(); ?>
It was previously set to “true” which I don’t believe is supported anymore, hope this helps someone.
Same problem. I am using custom post types that use custom single templates and wonder if it’s related.