Weird Login Problem

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thanks leefish, your hint helped me in finding what is causing the error. I did as you said and worked fine.
but i'm 2 codes in root .htaccess, one to hide the index.php and the other for hiding the subfolder which is "board"

so when user points to http://www.domain.com, he can see index page but the link dont have "/board/index.php"

i think the .htaccess code needs some moficiation to recify the first post error.