Sidebar keeps disappearing

https://quirm.net/2009/09/04/basic-wordpress-troubleshooting/

And a site url would help…

Sorry, forgot to hyperlink it:
https://dirtdiggersdigest.org/

Some of your php files don’t have a call to the sidebar, like for instance single.php: if you watch an article, the the sidebar disappears (it’s still there, but you don’t make a call to it).

Peter

I’ve never had the sidebar on my single posts. The problem I have is that it has been disappearing from my index page even though there is a get_sidebar command in the Main Index Template.

Could the problem be where it is located in that file? Right now is it at the end after </div>:

<?php get_sidebar(); ?>

<?php get_footer(); ?>

Its position in the source code is fine. Did you try deactivating all plugins?

I had earlier updated a plugin for which there was an update.

I’ve now deactivated all of them. Are you suggesting I leave them deactivated or re-activate them now?

Try leaving them deactivated for a while and test the site out thoroughly. If you don’t get any “disappearing sidebar” incidents, then it would suggest that one of your plugins is responsible. Activate them one-by-one and, again, test the site out thoroughly after each single re-activation. Hopefully, you’ll eventually find the problematic plugin.

LOL
You are using the default theme, it was built to act like this.
Edit single.php from your wp-content/themes/default folder and edit the file called single.php (with notepad or whatever text editor). Now delete all the content from there and copy this code instead:

<?php
/**
 * @package WordPress
 * @subpackage Default_Theme
 */

get_header(); ?>

	<div id="content" class="narrowcolumn" role="main">

	<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

		<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
			<h2><?php the_title(); ?></h2>

			<div class="entry">
				<?php the_content('<p class="serif">Read the rest of this entry &raquo;</p>'); ?>

				<?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
				<?php the_tags( '<p>Tags: ', ', ', '</p>'); ?>

				<p class="postmetadata alt">
					<small>
						This entry was posted
						<?php /* This is commented, because it requires a little adjusting sometimes.
							You'll need to download this plugin, and follow the instructions:
							https://binarybonsai.com/wordpress/time-since/ */
							/* $entry_datetime = abs(strtotime($post->post_date) - (60*120)); echo time_since($entry_datetime); echo ' ago'; */ ?>
						on <?php the_time('l, F jS, Y') ?> at <?php the_time() ?>
						and is filed under <?php the_category(', ') ?>.
						You can follow any responses to this entry through the <?php post_comments_feed_link('RSS 2.0'); ?> feed.

						<?php if ( comments_open() && pings_open() ) {
							// Both Comments and Pings are open ?>
							You can <a href="#respond">leave a response</a>, or <a href="<?php trackback_url(); ?>" rel="trackback">trackback</a> from your own site.

						<?php } elseif ( !comments_open() && pings_open() ) {
							// Only Pings are Open ?>
							Responses are currently closed, but you can <a href="<?php trackback_url(); ?> " rel="trackback">trackback</a> from your own site.

						<?php } elseif ( comments_open() && !pings_open() ) {
							// Comments are open, Pings are not ?>
							You can skip to the end and leave a response. Pinging is currently not allowed.

						<?php } elseif ( !comments_open() && !pings_open() ) {
							// Neither Comments, nor Pings are open ?>
							Both comments and pings are currently closed.

						<?php } edit_post_link('Edit this entry','','.'); ?>

					</small>
				</p>

			</div>
		</div>

	<?php comments_template(); ?>

	<?php endwhile; else: ?>

		<p>Sorry, no posts matched your criteria.</p>

<?php endif; ?>

	</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>