Oh, I found the problem. I'm using prosilver special edition themes. Not default styles. Change to default it's working well

PHPBB Seo has been installed in my forum. URL rewriting is working well. But, I have a problem. When I click new post or new topic, i get error 404 not found. What's wrong with my configuration. My .htaccess is located on root as well. This is my .htaccess configuration : # Lines That should already...