OK, Got it.
Your post made me think it had to be in a Playing Now tab, but not so.
I made MC crash. Here's how...
I went to playing now, and couldn't find any "Spotlight" to click on in the tree... So I re-read your post and sussed you were talking about links, so, why wasn't I seeing it?
Was because my Playing Now had video in it.
Me, being me, edited the Spotlight link and removed the [Media Type] filter completely. With video selected, MC just dies, disappears and needs relaunched.
I replaced the audio only filter in the link, but also made it open in a new tab, I personally feel that's better, especially with a middle click to close it being so simple.
Would be good if it will be expanded to also show a spotlight on movies and TV shows in the future.
-marko.