Registration will not complete

Setting:

Joomla 3.3, JFBConnect v6.1

Users can registrate and login through Joomla or with Facebook and with or without existing account.

Current Status:

User have Account -> First Facebook Login -> Connect to existing Account WORKS
User have Account -> Facebook Login -> Connects with connected Account WORKS

User have no Account -> User have to choose a User Name WORKS NOT.

After clicking "Facebook" from Login Panel (provided by SCLogin Module), the user can choose between connecting account (works) or creating new account. The user have to choose a non exisiting username. After typing a username and clicking "registration" the form will reloaded with no error messages or similiar. (Debug = On). No joomla or jfbuser was created in database. I tried this with different test user accounts.

Here the settings (I re-translate from German)

Configuration - Common Panel

User Section
activate automatic register: NO
register component: JFBConnect
merge user by e-mail: YES
skip joomla user activation: YES
username prefix: firlas
send e-mail new user: NO

Auto Register Section
generate random passwort: YES

Standard Register Section
register template/view: vertical
username field / register: generate and show
password field / register: generate and show
e-mail field / register: hide
fullname field / register. hide

All other options are default, API and other individual stuff not including.

Dear Alex,

thank you for your reply.

After long testing and reading the manual I have successfully solved the problem.

The magic happens with deleting the cache. I know, this should be Joomla Administrator's first step for error solving

Great product!

best regards

Marco