iframe works on a page, but not a single, why?

I assume this is message given by Vimeo? In that case it’s probably better to ask them.

I know that WP likes to strip out iframes completely, but if it did get to display nothing more WP can break.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)