This problem just came out of the blue it seems. I went to change a post today I had written a few months ago, and after I made the changes and clicked update it went right back to the original post... as if I had made no changes at all.
I am really baffled by this. I have tried disabling all of my plugins, and even changed the theme to the classic one, and still I could not edit any of my posts. Not matter how many times I try to change the post, or even erase it entirely, it will always revert back to the original post as soon as I click update.