log off....log on....and hope you are one of those for whom it works!
Thankyou, Daughter for the advice! It seems that many were having similar problems- I just mis-clicked at the wrong time, indeed losing the pages and/or content could have happened anyway.
Facebook changes continually, before you can get used to one thing it has changed- and not always for the better. They seem to live for change itself, which is not good for man or machine.
Evaluate what you have, deliberate, cogitate. Test the change you want properly, make sure that where you wish to apply it will work well. *Then* do it well and efficiently.