After upgrading to CiviCRM 4.7.15 on Drupal 7.50 Commons, I am trying to enable some permissions relating to CiviCRM, such as "manage tags" and "edit message templates" but any changes I make to the permissions will not "stick" after I hit save. There is no error message and there doesn't seem to be any related error messages in watchdog show or CiviCRM ConfigAndLogs.
Any guidance to troubleshoot is appreciated.