If it is updating on the back end and you are not seeing the changes on the front end then the only explanation I can give you is that the front end page is being cached. This does not mean that you have a cache plugin installed or active, just that it’s being caches somewhere.
On the other hand, if just adding a new blank post on the back end does not show content on the front end, the the problem is not on the back end it is in the template that’s showing the post.
Have you added functions and markup to the template page that shows the posts to get the field values and display them? What does your template code for these posts look like.
