I know this wont be so precizely written, but I cant describe it any better. Im in admin, and I pressed the save button on "permalinks option".

I have an article: www.example/video/title which then will lead to the main page (just showing, not redirected!).

But as soon as I make this in init action: $_GLOBALS['wp_rewrite']->flush_rules(true); it starts working immediatly!

But I didnt change anything on rewrite rules! So how or when could it be modified?