I have had this happen with a couple of fonts just after I updated my InDesign to the new version. I use the Adobe Type Library to activate fonts in the library. Normally this would not happen. When I try to change the face, from Regular to Bold (which is activated, and turned on), the entire paragraph disappears. I use InDesign for work, so need to work fast, and cannot get it to work right now. This has happened with Open Sans, as well as Yorkten (Which we have to use according to our Graphic Standards). And its only in InDesign.