admin-ajax.php 404

wp 3.5.1 bp 1.7 BPHC 1.1.3
On all common bp pages everything works fine. But, when it comes to custom pages like photowall.php (/members/photowall/) All hover cards began to get 404 from admin-ajax.php
Please help.

http://ww.wp.xz.cn/extend/plugins/buddypress-hovercards/