Why is there a big empty "sidebar"?

[Luminara]

 

That thing pops in, then is automatically removed... at least, it was, until last night.  Now it appears to be permanent.  Regardless of how many times I refresh the page, it's still there.  Almost a third of the available space, just... wasted.

[Bionic_Flea]

Mine shows this:

 

[Luminara]

4 hours ago, Bionic_Flea said:

Mine shows this:

 

 

Whadafuck?  There's supposed to be something there?

 

Huh.

 

You know... I'll bet it was my ad blocker.  Though, why it suddenly decided to only do half the job of hiding that, after five years, I can't guess.  But if it was, I can just kill the whole sidebar thing with it.

 

...

 

It was.

 

I did.