Preflight shows no errors but font not visible in layout
I'm working on a document that I have to revise that was created and last saved in August 2020 without any issues. But now in February 2021, the InDesign document is behaving oddly. Preflight shows no errors, but the font I'm using in the headlines has become invisible. I know the text is there as I can select the whole line of it. I've tried changing colors to see how it'll respond but it remains invisible. I see the font style is correct without any indicators – such as the brackets – that there's an issue and I checked the fonts in the document and they are all accounted for. I've checked Font Book to confirm that there's not a problem there. Has anyone else encountered this? What is the solution?