I’m having the same issue with a few wrinkles:
1. Can’t view ANY previous Posts, but the correct totals are listed by class – published, draft….
2. When creating a new post – no save or publish button
3. Unable to administer ANY plug-ins – error message: You do not have sufficient permissions to access this page
things I’ve done which HAVE NOT worked
1. validated the roles and access values were correct for the admin user in database tables
2. Created a new admin
3. Changed admin user values to something else and back
4. Changed to default template
5. Disabled ALL plug-ins
6. Re-installed latest version
