<div dir="ltr">Got it. In the preprocess I needed just to put the data in $vars['field_breadcrumb'].<div><br></div><div>----<br><br><div class="gmail_quote"><div dir="ltr"><div>I have the following line in THEME_preprocess_node</div>
<div><br></div><div><div> $vars['node']->field_breadcrumb['und'][0]['value'] = theme('breadcrumb', array('breadcrumb'=>$breadcrumb));</div>
<div><br></div><div>In Display Suite, I added a preprocess field. The machine name of the field is field_breadcrumb,</div><div><br></div><div>The field appears in the Manage Display settings, but its contents don't appear when the display is rendered.</div>
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