In the permissions area, make sure that Super User has all boxes checked EXCEPT for the first box "Edit Own Items Only". Then also make sure that your user is assigned only to the super user group. If assigned to other groups (which isn't necessary), this could cause issues. Remove the other assignments, save the user, logout then login again. Joomla requires that for changes to be applied (unless you have our ACL Fix plugin installed which corrects that).
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