After upgrading Jenkins the Radiator view no longer works.
The only thing displayed on the page is:

• Pale Grey Jenkins Header bar.
• Small black bar with question mark icon at right hand side.

After a quick look at it:
Radiator view has a div called "dashboard" with the following style: height: 100%; width: 100%;

Tweaking this to height:800px for example will then show the content, although not full screen.