Strange URL for previews.

Yes. That happens on all browsers. And it is probably our corporate firewall that blocks. Somewhere on adobe.com, I found a bunch of websites Adobe uses for stock and different other services. I've for now asked to open those addresses. I was just wondering why to use for one specific element a different root as adobe.com. Sounded kind of suspicious at first. I suppose there are historical reasons (do not break a working code) for those sites. Or they are simply third party services you hire for your needs.

Whatever it is, we have a very active access blocking group, so that things that worked before may be blocked tomorrow because of having one address appearing on the blocking list. 90% of my IT problems are caused by my corporate IT (they probably know how to manage hundreds of CAD workstations but not half a dozen of creatives...). (sic!)