I think it is the same problem that I have with meta_term which comes from the post revision check in the save_post method of the RW_Meta_Box class.
I did override the complete save_post method into the MB_Term_Meta_Box class which extends RW_Meta_Box and make sure to remove (or comment as you wish) those lines:
// Make sure meta is added to the post, not a revision.
$the_post = wp_is_post_revision( $post_id );
if ( $the_post ) {
$post_id = $the_post;
}
Truly yours,
Eric
