Since upgrading to 3.6.1 on multiple sites I;ve been getting the following message any time I save/update/publish a Post.
Connection lost. Saving has been disabled until you’re reconnected. We’re backing up this post in your browser, just in case.
This message is followed by /wp-admin/post.php landing on a "Nothing Found" 404 page.
The Post is accessible with any changes during and after these messages.
Any ideas what may be causing this?