Preview window background cubemap gone in 4.14?

In preview windows (e.g. blueprint viewports, material viewports, physics asset viewport…etc) the background used to be gray, and there was ambient light and reflections from a default cubemap (of some office buildings I think). But this is gone in 4.14? The background is now black and everything looks a lot darker when its not facing the single light in the preview ports, reflections are also gone too. Anyone know how to set the background cubemap in the preview windows?

Edit: I found the show background checkbox under “Show”, but where can I set that background? (currently it’s showing nothing)

Simply go top left dropdown… “Window” → Preview Scene Settings → and make sure that show environment is checked. Hope this helps. Cheers.