Can't access in the frontend

Hi,

a user recently said to me that he can't login anymore. So i created a dummy user and assigned him to the "Registered" group like all the other users and i couldn't login as well.

I get the message: "You cannot access the private section of this site."

As super user i can login in the front.

After doing a little research i found that it might have something to do with the rights management but i haven't changed a thing.

What i have checked so far:
- Site -> Global configuration -> Permissions -> Public group is allowed to do a "Site login" and Registered inherits the right

The figures are:
Joomla 2.5.14
php 5.5.3
CB 1.9

I appreciate all ideas.

Regards
Ricosta

Just found the reason, maybe someone else interested in too:

1. Make a database backup
2. Login to your database (phpMyAdmn) and view table *_assets
3. Sort table by column parent_id
4. Likely you'll found multiple entries with a 0 in parent_id but there should be only one entry, the root
5. Edit the respective entries and change the 0 to a 1 (except for root!!!)

After that it has worked for me.

Found it here:
lessi2306.blogspot.de/2013/08/joomla-frontend-anmeldung-nicht-moglich.html