EDIT : Problem was an eror in configuration for mightysites => They work fine together !

Hi,
First,  i use mightysites. It allows me to share db between subsites so that i can share all the users between subsites (or other sites).Basically, it allow to have single login between this sites...

Second, i use chameleon to switch from one to the other subsites (depending on "component") and it works great !
using chameleon facilities eg if component == com_kunena  return true
run PHP => 
$app = &JFactory::getApplication();
$url = 'http://FORUM.MAINSITE.com/' . $_SERVER['REQUEST_URI'];
$app->redirect("$url");

Problem is that it seems, that the plugin (auto login from mightysites) doesn't work with chameleon.

How can i get the users keeping logged from each subsites and sites, perhaps with chameleon directly ?
With regards,