If a user tries to login in a translated version he arrives in the original version after the login.
If he then switches back to the translated version Wordpress don't recognize him, as for example the commends
edit_post_link('Edit')
current_user_can('level_x')
are not working as they should when logged in.

Andreas

We support translation for blog pages only, not admin pages. What are you exactly looking for?

I'm not looking for a translation of the admin pages.

On my page (http://www.webcams-worldwide.info/) registered users have to possiblity to create a list of there favourite webcams.
If the user is on the original, englisch version everything is fine, but if he tries to login in a translated version he gets redirected to the original version. If he then switches to the translated version again he isn't recognized as logged in.

I didn't test, but the problem should also be the same if users needs to be registered to leave a comment.

Andreas