I think you need add:
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
Access the network in the Tools menu to see how to get your .htaccess file.
Sorry for my bad english.
http://cassiosantos.com/
I changed the file query.php to see which custom field was passed.
If the field is numeric, I use the solution below:
$orderby = "$wpdb->postmeta.meta_value+0"
Otherwise I use the default WordPress:
$orderby = "$wpdb->postmeta.meta_value"
But now I face a very similar problem: if the field is a date, what do I do?
