If you've been to the site before it may help to clear the cache.

If you look at your front page, then view a video and subscribe, and then look at the front page again, you should see what you would expect to see.

The sad thing is that not even youtube has a subscribe button that works.

It's device specific so you don't have to sign in to use it. Is that a plus or minus? But I think people like to watch different content on different devices anyway, and most people don't like signing into things to use a feature.

Proper search next.