I recently switched hosting providers. I installed a fresh copy of wp on the new host then did a restore of my posts and pages. I had the same problem when I tried to manage my pages. Managing posts and creating new pages wasn’t a problem. I just couldn’t manage the pages after they were published. The good news is that the pages were visible on the site. I just couldn’t manage them.
To get around this I had to logon to my wp-admin dashboard and change the theme back to the default theme. Then I clicked on View Site button. On the left panel you are able to click on the individual pages. Click on each page to view them. Then click on “edit this entry”. For me I just deleted the pages one at a time. The problem went away after I deleted the Child pages of one of the main Parent pages.
I hope this helps.
