I also tried uninstalling and reinstalling Storyline 360. I have tried uninstalling and reinstalling my Helvetica and Helvetica Neue font families, with no improvement. These are Storyline files that I have been accessing and saving with no issues in the last few months. I'm having issues with a few Storyline 360 files I've been working on for a while suddenly showing Helvetica font as very thin, and spaced differently.