症状

Neither adding view restriction or edit restriction will update the screen with the appropriate restriction.

診断

Firebug or Chrome Developer tools shows 404 when clicking on the "me" element. Changing to a different theme corrects the problem.

原因

You may have an invalid page layout specified.

ソリューション

1. Admin >> Layouts >> Page Layouts に移動します。
2. If there's a non default layout, edit it, then save it in a file for backup.
3. Restore to defaults.