Content block only shows after publishing post

Hi. Thanks for making such a great plugin! I have one small issue, which is that the block only shows in the admin after I publish the post. Is that normal? I’m using a custom theme so maybe I did something wrong, but I turned off all other plugins and that did not help. I tried every combination on the setting page. I tried enabling and disabling the visual editor. I tried endwhile; wp_reset_postdata(); at the end. Everything works fine as long as I publish once, then switch to draft mode while I write the post. Any help would be appreciated! Thanks. Here is the code I have:

<div id="second-column" class="col-xs-6"><!-- START right col -->
<?php the_block( 'Second Column' ); ?>
</div><!-- END right col -->
</div><!-- End Row -->
</div><!-- End About Section Content -->
</div><!-- .entry-content -->
</article><!-- #post -->
<?php endwhile; wp_reset_postdata(); ?>

https://www.ads-software.com/plugins/multiple-content-blocks/