For instance, when setting up an ezcomments definition on ezpublish.yml such as:

ez_comments:
    system:
        default:
            content_comments:
                main_ruleset:
                    enabled: true
                    match:
                        Identifier\Contenttype:
                            - article
        eng:
            default_provider: disqus
            disqus:
                shortname: <your-disqus-shortname>
        ger:
            default_provider: facebook
            facebook:
                app_id: <your-facebook-appid>

The "ger" site access in this case (or any other, for that matter) is not working when I try to access the same content (Comments/Article-with-comments) via URL with that particular siteaccess (I get a 'Module Not Found' error; I'm using eng siteaccess as default siteaccess)
Accessing http://<hostname>/eng/Comments/Article-with-comments works.
Accessing http://<hostname>/ger/Comments/Article-with-comments doesn't.
Trying to fetch the parameters manually from the yml configuration, using the ConfigResolver, works fine, so it doesn't seem to be a ConfigResolver problem.