Front end User Login Problem

Hi,

I had been investigating about the problem, one thing I found is that the user with the problem was the last user created in the system, so I tried to create another user and found that when a new user is created another error message appear:

"access user group invalid"

This new user shows OK in the backend but have the same problem, can not login.

I checked the user modules and the login ones and first time user is always set in the registered group. this is ok in the database.

Need help to handle this new found error.

I can't find a "access user group invalid" error anywhere in core Joomla or CB. Is that the exact error message being displayed? It's likely coming from something 3rd party. Check Extensions > Plugins for 3rd party system, authentication, and user plugins then disable them.