@dfunk006
 
	Thank you for the quick respond!
 
	 
	I placed Hybridauth in site/libraries/hybridauth  
	Probable we are talking about different versions of PW (mine - 3), because I didn't find that piece of code in index.php.   
	But I found and comment this in Session.php
 
		if(ini_get('session.save_handler') == 'files') {
			if(ini_get('session.gc_probability') == 0) {
				// Some debian distros replace PHP's gc without fully implementing it,
				// which results in broken garbage collection if the save_path is set.
				// As a result, we avoid setting the save_path when this is detected.
			} else {
				ini_set("session.save_path", rtrim($this->config->paths->sessions, '/'));
			}
		}
	And it doesn't help.  
	Any other suggestions?  
	Thanks a lot!