[joeroberts]

OK here is fix
open admin-forums.php
find

if($do == "delete_forumcat")

and add before

if($do == "add_this_forumcat")
//add to db & create autolink
{
$error_ac == "";
if($new_forumcat_name == "") $error_ac .= "<li>Forum cat name was empty\n";
if($new_forumcat_sort == "") $error_ac .= "<li>Forum cat sort order was empty\n";

if($error_ac == "")
{
  $sql = "INSERT INTO ".$db_prefix."_forumcats (`name`, `sort`) VALUES ('$new_forumcat_name', '$new_forumcat_sort')";
  $ok = $db->sql_query($sql);
  if($ok) {
  echo("Forum added <a href='admin-forums.php?action=add'><strong>back</strong></a>");
  die();
  }
  else echo "<h4>Could not save to DB - check your connection & settings!</h4>";
}
}