I'm using latest beta version. I started having this problem after I upgraded it to 2.7.
After i post something or update one of my post, It would normally show a notice in yellow box on top my post saying that it's been posted/updated.
When i hit "Publish/Update post", it takes me to 404 page of my blog. It posts/updates but it can't redirect me back to the post editing screen.
I'm hoping this would go away as soon as I upgrade my to a stable version. I don't have this problem on my other 2.7 blogs.
Can it be something I did wrong during the upgrade?