My host (Joyent) seems to have issues with this plugin after I moved over to their new servers running PHP5. At issue appears to be the differing use of the full
<?. For whatever reason (I'm a programmer, but do not keep up with such things), not using
<?php causes the plugin to load as plain text and therefore is not parsed.
Simply replacing all
<?php fixed the issue. Hope this helps anyone who comes across it.