Can't Edit or Post a New Post After 4.3 Update

I updated to 4.3 yesterday and everything seemed fine. However when I try to add a new post or edit a post after a minute or two I get a 504 Gateway Timeout. I can do everything else such as add media, plugins, etc. I deactivated all of my plugins to see if that helped but it didn’t. The thing is that I have two blogs and updated both of them. One works perfectly and the other has this issue. The one with the issue is http://ritareviews.net
I thought it might have been a theme issue but I went in and changed my theme but that didn’t help either. Does anyone have any idea what the problem is and how I could fix it?