I was under the impression that when selecting a language, from the language selection block (in drupal6), the content is also filtered to display only the nodes in the selected language
This behaviour is also confirmed by this handbook page http://drupal.org/handbook/modules/translation
Use the language switcher block provided by locale module to allow users to select a language. If available, both the site interface and site content are presented in the language selected.(maybe this is not really for drupal 6.x as it states ??)
I have also looked for any configuration setting that enables such a thing but found nothing ....
I finally filled out a bug report http://drupal.org/node/233242 but did not get any response yet ...
This is happening on a clean install so it could not be a bug originating from another module ...
What is your experience, am I missing something obvious ??