<h4>Groups Module — Additional Fixes</h4><ul><li><strong>Fixed:</strong> TypeError: output.show is not a function (group_details.php:369) — <code>output</code> is a DOM element from <code>getElementById()</code>, not a jQuery object. DOM elements don't have <code>.show()</code>. Changed to <code>output.removeAttribute('hidden'); output.style.display = '';</code>.</li><li><strong>Fixed:</strong> Undefined array key 'EvenCategoryID' in event_list.php:34 — typo, missing 't'. Changed to <code>EventCategoryID</code>.</li><li><strong>Fixed:</strong> Undefined variables <code>$atag_start</code> and <code>$atag_end</code> in newsfeed_section.php:123,136 — initialized as empty strings before the foreach loop.</li><li><strong>Fixed:</strong> Undefined array key 'source_url' in newsfeed_section.php:154 — added <code>?? '#'</code> fallback.</li><li><strong>Fixed:</strong> Trying to access array offset on bool in newsfeed_member.class.php:908 — <code>$a=false</code> then <code>return $a[0]</code>. Added <code>is_array()</code> guard.</li></ul><p><strong>Files:</strong> group_details.php, event_list.php, newsfeed_section.php, newsfeed_member.class.php</p><p><strong>Result:</strong> Group detail page id=129: 18,772 lines, 0 PHP warnings.</p>