Cannot Login to router by IP, but only by MAC

hello guys,
i can connect to router by mac but i cant connect by ip
i am using winbox software
i have set ip address for router and pc
i have read this http://forum.mikrotik.com/t/cannot-login-to-router-by-ip-but-only-by-mac/119175/1
but i have problem still
i would appreciate your help
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