Zen cart login problem

HI i just instaled a new template for the site
Everithink works fine but i still have a problem in customers area.

1. If i go to create a new member acount the sistem register the name and the client can buy from the site but when exit from the site and he wants to log in again on the site with email and pass the sistem tells us : ERROR_SECURITY_ERROR
and the customer can`t login in to the account


does some one knows how to fix this problem ?
the link of the site is http://www.aincomputers.com

Thanks

And also i do not have a logout button how should i create ? and how to do it

First, switch back temporarily to the 'classic' template to see if it's a template issue.

same think to the clasic can`t login but in the clasic i see the logout button in this template i can`t see the logout button