We are using WordPress 3.8.1 at Shopsos.com
THE SYMPTOMS: From the Admin dashboard Posts: All Posts (wp-admin/edit.php) returns a blank page. Additionally, Posts: Categories returns a Categories page with no categories listed (although the number of categories for the site are enumerated at the top of the page with many pages of categories). One of the plugins settings pages also returns a blank page. Pages also returned a blank page, but that part is resolved.
WHAT I'VE DONE: First I disabled all of the plugins. Two plugins upon deactivation returned the function of displaying Pages. But deactivating all of the plugins resulted in no change for the page display of posts, nor categories. The posts are therefore available from the front end, but not the dashboard.
I reinstalled wordpress. Then, out of frustration also replaced the wp-includes folder as well as the wp-admin folder with fresh folders from a new download of wordpress.
Last, I restored from a Vaultpress backup.
The theme is Pagelines (Pro version).
I simply don't know what to do next to get this working again. Thanks in advance for assistance.