I tried your suggestion and deactivated and deleted the plugin. I reinstalled the plugin via the Plugins->Add New, and the problem continues to exist.
I should point out that I’m using custom single-aol_ad.php and archive-aol_ad.php templates.
Changing this:
//Show this content if you are viewing aol_ad post type using single.php (not with single-aold_ad.php)
if(is_singular() and 'single-aol_ad.php' != wp_basename($template)):
$new_content = '<div class="aol-single-ad">'.$content.$title_features.$features.$title_form.$form.'</div>';
endif;
return apply_filters( 'aol_content', $content, $features, $form );
To This:
//Show this content if you are viewing aol_ad post type using single.php (not with single-aold_ad.php)
if(is_singular() and 'single-aol_ad.php' != wp_basename($template)):
$new_content = '<div class="aol-single-ad">'.$content.$title_features.$features.$title_form.$form.'</div>';
return apply_filters( 'aol_content', $new_content, $content, $features, $form );
endif;
return apply_filters( 'aol_content', $content, $features, $form );
At the bottom of class-applyonline-public.php fixed my issue as $new_content
is undefined for me due to the wp_basename($template)
condition.