Update button greyed out

As I am making edits to one of my pages (http://www.leadingwithideas.com/?page_id=656), the Update and Preview buttons stop being live and I can’t do anything to restore their functionality … meaning I can’t save any of the edits I just made.

I’ve noticed that when this occurs, the following message is appearing at the top of the WP Edit Page page: “The backup of this post in your browser is different from the version below. Restore the backup.”

This issue only seems to be occurring with this page. I’ve updated all my plugins based upon the feedback I received the last time this was occurring. Any ideas what may be happening here?

Thanks for any help you can provide.

Hello Lance,

It can be a problem with one of your plugins.

Please try to deactivate all your plugins except recommended and see if it helps.

Kind Regards, Roman.