Incomplete access to Dashboard via web interface

You don’t have some kind of an ad-blocker on that problem PC by any chance, do you? See this →   http://community.wd.com/t5/WD-My-Cloud-EX2/Settings-gt-Network-page-is-mangled/td-p/758970

If that does happen to be the case and resolves your issue, please click the star on the left under my username to give me a kudo and mark this post as the solution.