[Plugin: Hide Login] Cannot log out with version 2.1

I tried this plugin and felt very well except the “logout action“.

I’ve set the logout slug to “t_logout” and the login slug to “s_login”.
I’ve enabled the hide mode and it really been working, for which I could not access http://XXX/wp-login.php but http://XXX/s_login.

Then I tried “http://XXX/t_logout” and got a redirected url which was “http://XXX/wp-login.php?action=logout&_wpnonce=YYYYYYYY&hide_out_key=ZZZZZZ”.

But both of the two addresses didn’t work, so I could not logout in any way.

Does anyone get into the same question?
In addition, my wordpress version is 3.4.1.

http://ww.wp.xz.cn/extend/plugins/hide-login/