The Viewer tab does not display but View in Browser works fine. Found in 8.6, checked again in 8.6.5, and still has the same behavior. Verified on Bill Dyck’s machine also.
Yes, like Chris says, in Windows or Mac, with the latest versions SAB there should no longer be any problem displaying the Viewers (for books and About) since the relevant display components are packaged in the installation. It is not related to which JDK you have installed.
Does it work with other books? In the image above, it is showing blank for Chapter 1. Do you have a chapter 1 or is all the content in the introduction (chapter 0)?