New answers tagged credentials
I'm not sure I understand the question exactly, but if you mean showing a different top nav, left nav, and web parts per user it's probably easiest to use the "Target Audience" functionality on the individual navigation links & web parts. With that, you can use AD groups, SharePoint groups, or even individual usernames to show different content on the ...
There is a feature in SharePoint 2013 called MDS (minimal download strategy), try to turn this off in site settings -> site features. Then, check if the issue persists and give your feedback.
To be honest this sounds a lot like the same issue I've seen in our own environment, and once again at a client. But these two are a minority of cases. Here's additional info: http://social.technet.microsoft.com/Forums/sharepoint/en-US/56a3aaae-14c5-40dd-b87b-23c046f75980/sharepoint-2013-random-authentication-issue-where-users-are-suddenly-anonymous ...
Also, try right click on "SharePoint 2013 Central Administration" and select "Run as administrator".
Top 50 recent answers are included