I'm using, SilverStripe CMS - 2.3.2 on apache.
I can't add users to a security group. Also in firebug i see the same error says:

Behaviour is not defined
security()security (line 504)
[Break on this error] <script type="text/javascript">Behaviour.addLoader(hideLoading)</script>\n

When i click add user after filling form fields, i take this error message (server can't found??)

Website Error
There has been an error

The website server has not been able to respond to your request.

I'm confused how can silverstripe developers can publish this version without user modify.
Is there anyone having the same problems?

Hi willr,

Thanks for the quick reply. Here is the error what i get:

User Error] Uncaught Exception: Object->__call(): the method 'addtogroup' does not exist on 'Form'
POST /admin/security/EditForm

case isset($config['function']) :
507                return $config['function']($this, $arguments);
508             
509             default :
510                throw new Exception (
511                   "Object->__call(): extra method $method is invalid on $this->class:" . var_export($config, true)
512                );
513          }
514       } else {
515          throw new Exception("Object->__call(): the method '$method' does not exist on '$this->class'");
516       }
517    }
518    
519    // -----------------------------------------------------------------------------------------------------------------
520    
521    /**

Ah no sorry never seen this. Perhaps double check you uploaded all the files successfully this revisit the page with a ?flush=1 attached to the url