pages in social them not displaying

Some of my pages, About for example, don't display and I get a 404 type message "Permission Denied

Not Found / No Access

The page you are looking for either does not exist, or you do not have the permissions to access it."
I'm signed in as admin. I'm using Social with buddypress and a single-user WP install.
I had a similar problem with the Q&A plugin. I got the same message for some of the questions.
I deactivated Q&A but the pages still don't display.