<ul><li><b>js.php loadFile fix</b>: <code>output.show()</code> called on raw DOM element — <code>show()</code> is a jQuery method; changed to <code>$(output).show()</code></li><li><b>gbl_class.php upload_image fix — mkdir empty string</b>: when <code>$thumb=FALSE</code>, <code>$thumbfolder</code> stays empty string; <code>mkdir("")</code> was always called → PHP Warning; added <code>!empty($thumbfolder)</code> guard before mkdir</li><li><b>gbl_class.php upload_image fix — missing error key</b>: on successful upload <code>$msg["error"]</code> was never set, causing <code>Undefined array key "error"</code> in group.controller.php line 263 when checking <code>$upload["error"]</code>; added <code>$msg["error"] = FALSE</code> on success path</li><li>insertGroup with image upload now returns clean JSON with no PHP warnings ✓</li></ul>