Sorry, but I can't see anyone's day streak. Is anyone else having issues with this or only me?
If what you're referring to is the streak number on profile pages, it's been removed when profile pages were switched to the achievements view. You can now see user streak and other info on (duolingo.eu), an external site not maintained by duolingo.
Example: your profile page is https://www.duolingo.eu/Marek598858