I believe it is related to some permission issue, your menu item access etc. Can you send me your website and admin user details using contact us form to check the issue?
The issue caused by missing user profiles. The users are not synced for the first time from sociable users page and also the sociable user plugin is disabled. I fixed them now, please check. Also please follow all steps from below documentation to avoid any issues further.
corejoomla.com is not affiliated with or endorsed by the Joomla! Project or Open Source Matters. The Joomla! name and logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.