it is a big problem. when a new user sign up in my website, as usual in wordpress, one email will be sent to him/her to be able to set him/her password.
the email will be sent but the link is incorrect. it is like so:
Username: username To set your password, visit the following address: http://end-eng.com/wp-login.php
as you see, the link is for login page, not for setting the password!!!