WordPress Failed everytime I try to post, have to post thru Drafts

It might be helpful to see the error message.

Any errors in your web server’s error logs that you might share as well?

Does this post help?
http://wordpress.org/support/topic/165717?replies=27

Otherwise, a search on “your attempt to edit this post” in these forums will turn up a few other threads. Many seem to revolve around plugins and ensuring they are compatible with your version of WordPress.