There was a fix mentioned in a thread a while back, almost a year ago.
Line 217 of footnotes.php needs to be replaced from:
$id_title = str_replace('"', """, htmlentities(strip_tags($value['text']), ENT_QUOTES, 'UTF-8'));
to:
$id_title = str_replace('"', """, html_entity_decode(htmlentities(strip_tags($value['text'])), ENT_QUOTES, 'UTF-8'));
As detailed here.