Have the PMPro membership content filter fire later.

init_pmpro_membership_content_filter_later.php

function init_pmpro_membership_content_filter_later()
{
	remove_filter('the_content', 'pmpro_membership_content_filter', 5);
	remove_filter('the_content_rss', 'pmpro_membership_content_filter', 5);
	remove_filter('comment_text_rss', 'pmpro_membership_content_filter', 5);
	
	add_filter('the_content', 'pmpro_membership_content_filter', 15);
	add_filter('the_content_rss', 'pmpro_membership_content_filter', 15);
	add_filter('comment_text_rss', 'pmpro_membership_content_filter', 15);
}
add_action('init', 'init_pmpro_membership_content_filter_later');