After updating to wordpress 3.1 from 3.0.5 the "report & delete" spam comment option no longer functions. The ajax call instead ends up in the url as:
http://website domain]/wp-admin/admin.php?avhfdas_ajax_action=avh-fdas-reportcomment&id=[comment id]&_wpnonce=[unique value]
A blank page is returned and the comment is not processed.
Information in brackets is sanitized for security.