I have a document I work on often, my resume. I have created a few different styles that I use and for some reason the non-printing characters have stopped showing properly. I have the option enabled (the reversed P) and ensured "All" characters are selected in the preferences. Here is a screenshot of the current view:
basically, only the tab stops and the returns are showing.
Upon doing an experiment by creating a new document, all characters (especially the spaces) show up nicely:
I can copy this line and paste it into my resume document and it shows up there too. It seems my styles are doing something...