I have no idea if it is ebay or not, however for the first time this week I had one (very good selling) listing vanish off the face of the earth. (or the first time I have noticed).

And I know there was plenty of stock of it listed because I'd only checked the day before (27 of that item in stock on ebay).

I couldn't find it anywhere and only noticed it was missing because I went to list something similar and was going to use it as a template....

It was even invisible in my own store.....

I don't think it is in ebay's interest to intentionally blackout some and not others, I think this must be some kind of glitch.

The item of mine that went missing is probably my best selling listing, but I didn't sell 27 in a 24 hour period.

I eventually found it by looking at my sold items and revising it from there, that worked and it was visible again within about 15 minutes, and fairly high up the search rankings where I'd expect to find it.

So who knows?