Cusom Fields not enabling

Hello,

I have tried everything but it seems that I cannot get the “Custom Fields” option to enable in the screen options section when I trying to make a new post. I have made sure it is checked before a refresh and nothing happens, it won’t enable!

Then I tried inserting the following code earlier into (functions.php)from another post I read that was supposed to “change what’s hidden by default” and that didn’t work.

Please Help???

Thanks.

// Change what’s hidden by default
add_filter(‘default_hidden_meta_boxes’, ‘be_hidden_meta_boxes’, 10, 2);
function be_hidden_meta_boxes($hidden, $screen) {
if ( ‘post’ == $screen->base || ‘page’ == $screen->base )
$hidden = array(‘slugdiv’, ‘trackbacksdiv’, ‘postexcerpt’, ‘commentstatusdiv’, ‘commentsdiv’, ‘authordiv’, ‘revisionsdiv’);
// removed ‘postcustom’,
return $hidden;
}