I use Lightbox theme and after trying absolutely everything else that all the forum posts had mentioned, I finally worked out myself what to do – so this may help others too. In the comments php (in appearance – editor) I removed this line of code:
<p><span><?php _e(‘You may use these <abbr title=”HyperText Markup Language”>HTML</abbr> tags and attributes:’, ‘photocrati-framework’) ?></span> <?php echo allowed_tags(); ?>
</p>
I didn’t replace it with anything else, as many other people have done so, or have suggested – which didn’t work for me.
Glad it’s resolved.