Reply To: That was scary! What paragraph style caused entire 388 page document to be invisible?

You can get all the text in a story to disappear by applying “No Break” to all of it. Then it effectively becomes all one long line that can't possibly fit any text box.

Why would you want to do that? Well I'm glad you asked me that. It was a document using an old font which “re-used” all the code points for various characters in one of the Indian scripts, such that the text was only usable with that particular font – any other font and it showed rubbish text – and you had to change font every time an English word like a company name was used.
Some of the re-used code points would be punctuation marks in any sane font, so InDesign would break lines in the middle of words. Fixed by applying No Break to everything and then taking it off spaces and anything else where you wanted a break to be allowed.