John Havlik

Give what is on the site linked, .breadcrumb probably will not target your breadcrumb trail, you probably want .breadcrumbs.

In your theme’s style.css you have something around like 900 that is setting the background of the .breadcrumbs class to white (#fff). You’ll want to change this to whatever color you want. I suggest using your web browser’s built in inspector tools to test the changes you want to make before editing your style.css.

Enhanced compatibility with WPML is available with the Breadcrumb NavXT WPML Extensions plugin. Your other option is to write an action that translates the root page IDs for CPTs in the Breadcrumb NavXT options just before filling the breadcrumb trail (place this action in a site-specific plugin). Either option is better than modifying the core plugin.

This was already brought up in this thread: https://wordpress.org/support/topic/structured-data-error-a-value-for-the-item-field-is-required/

To generate fully ‘compliant’ you can set “Link Current Item” in the settings page. However, the Google Structured Data Testing Tool wasn’t reading it correctly if you fetch from a URL rather than paste in the markup (as of earlier this week, may be fixed now).

Otherwise, if you do not want to link the current item, it appears, according to https://github.com/schemaorg/schemaorg/issues/982 that the metadata should not be included. I’ll change this in the default settings, but you’ll need to update your settings. Replace things such as:
<span property="itemListElement" typeof="ListItem"><span property="name">%htitle%</span><meta property="position" content="%position%"></span>
with
%htitle%

Normally, to exclude the breadcrumb trail from the home page, you would use the following calling code:

<?php if(function_exists('bcn_display') && !is_front_page()):?>
<div class="breadcrumbs" typeof="BreadcrumbList" vocab="https://schema.org/">
    <?php bcn_display();?>
</div>
<?php endif; ?>

This will prevent any output from Breadcrumb NavXT on the front page.

The “change” to @id, is only for Schema.org BreadcrumbList in the JSON-LD format (and that happened over a year ago). The current issue appears to be the google structured data tool puking over something else on the page, if you delete everything but the code that Breadcrumb NavXT generates (and the wrapping div), the structured data tool is happy.

If you use the recommended code for calling the breadcrumb trail. It looks like the theme (at least in the example link provided) is missing the typeof="BreadcrumbList" vocab="https://schema.org/" in the div that wraps the breadcrumb trail. Without that, Google won’t automatically pick up the schema.org BreadcrumbList data and won’t pull into the search results.