Cacherouter + Xcache + Boost + multi-site compatibility

Hi,

I just installed 6.x-1.x-dev 2010-Apr-22 addition of cacherouter. I tried to set it up with XCache 1.2.2 with multi-site configuration and boost module enabled.

I added the following to each of my multi-site's settings.php:
$conf['cache_inc'] = './sites/all/modules/cacherouter/cacherouter.inc';
$conf['cacherouter'] = array(
'default' => array(
'engine' => 'xcache',
),
);

However after I enabled the cacherouter module, I started having issues where the theme for some of my sites are all messed up. Like SiteA showed up with SiteB's theme, and SiteC shows with SiteA theme. And if I remove the cacherouter lines in my settings.php for each of the sites, everything gone back to normal.

Anyone experienced such behavior or I set it up wrong? =/ (Yes, I'm newbie :) )
In all cases, I cleared the cache in my xcache and boost, but behavior remain the same.

thanks,