Today I have had an issue for the first time where when I am working on a old draft to update it, it will disappear. When I tell it to save, it refreshed the page to before all my work. I am able to go back in the browser to find my work, but there is not even an autosaved version of my draft.
What I have been able to do is copy my html after I work on it and then paste it into a new post and publish it that way, but I cannot seem to update any drafts.
Also, I am unable to delete any drafts, or send them to trash. For instance after I took the html from one draft, updated and made a new post then wanted to delete the unchangeable draft, nothing happens when I send it to trash.
This afternoon I saw another thread that had the same issue. (I did not realize I would be trespassing to post that I also was having the same issue.) http://wordpress.org/support/topic/post-draft-disappears?replies=5#post-1651908
I have tried deactivating ALL plugins and the issue still persists.