Thank you for your prompt reply!
Before it came, I had actually duplicated the chapter and subbed the copy into the book. Now getting a different error:
Server error: POST https://mpl-publisher.com/mpl-publisher/print
resulted in a 500 Internal Server Error
response: <html><head> <meta http-equiv=”content-type” content=”text/html;charset=utf-8″> <title>500 Server Error</title> </head> (truncated…)
So am confused as to what that means.
(I did clear all cache and restart browser and computer as well.)