ors

Got it working with this:

<?php
	$posttags = wp_get_post_terms( get_the_ID() , 'post_tag' , 'fields=names' );
	if( $posttags ) echo implode( ',' , $posttags );
?>

Oh, I forgot to tell you. We installed an older WordPress version with the exact same theme a couple of months ago and the import was a success.

Could a simple solution be to just use an older version? Though I would really like to run the latest release..