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The links at the top are different for the Model S forum ... and missing the "Mark Forums Read" link ... which I use all the time (to make that and its subforums read). That broke within the last week or so ...
This is similar to the issue I had previously reported at Complete Banner Not Always Visible, just a new forum based off listing all vehicles instead of just the Model 3 in the banner. This change is only there when you are on Page 1 of each top-level forum section. In this case, if you hover your cursor over the "Forums" text, you'll get a drop-down box that has the Mark Forums Read option.
While I understand the desire for the shortcuts to each vehicle, I don't like the context sensitive banner. Nothing for me to get bent out of shape about, as long as it's a conscious decision by the admins.