Preview button loads posts page

Hi,

I’m desperate. I’ve tried everything that I could find on numerous forums that I could find on the internet.

I hit the preview button and it leads me to the posts page!!

I’ve disabled all plugins and the changed the theme and back again. It works the first time I do it. But then even without reactivating any plugin, it goes back to loading the posts page!!

I don’t know what else to do.

It was working fine. I didn’t change anything or installed any plugin when it started doing this.

Please help.