Permalink – oops! That page can’t be found

I have always had permalinks set to postname. Now I get the error: “Oops! That page cannot be found” unless I change the setting to plain. I have deleted the pages, re-created them. Tried all different settings. Plain is the only one that works. Please see attached screen shots. 2 setting screen shots of permalink page, and one screenshot of SCO Dashboard notification when I set permalink to plain. Pages work if set to plain, they give the oops message if set to postname. My permalinks always use to be set to postname with no problems. Please advise. Someone also tell me how to attach a screenshot file here. There is no paperclip.

The page I need help with: [log in to see the link]