Changes not being saved

This is a weird problem… I just recently upgraded to the latest WordPress. Everything seemed to be okay until I tried editing a post.

I can write a post just fine. And I can even edit that post (to add text, link, etc.) and have the text show up when it’s published. The problem is when I go to edit it a second time… when I do the text that I added previously is gone. Like it never happened.

So if I click publish it removes my first series of edits. The original post is there, just not my first edits. Has anyone run into this problem before? Thanks.