Rt update ticked re-login

I have RT set up for test on Fedora with Mysql and sendmail. Seems to work
just fine with one exception. Every time when i update, assign, take or
resolve a ticket i get kicked back to the login page. The intended operation
goes through. anyone any idea why is this happening? I does not happen when
i do changes to the configuration or add new users.

Thank you!
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