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I have with joomfish 2 languages: NL + FR
NL is the default language
When a registered user comes to the site in language FR (index.php?lang=fr)
After login in in the FR-site the user language is set back to NL.
It goes to the default page but in the wrong language.
The frontend language of the user is correctly set.
How can I stay in the same language?

How exactly have you set the redirects in both login menu items?
please follow precisely the tutorial: http://multilingual.demojoomla.com/fr/i ... angue.html