I have two fonts in my atlas. They both show up in the atlas drop down list. But when I go to make a label, sometimes only one of the fonts shows up and the add to button is grayed out. If I update the font then it shows up twice. If I close Unity and restart it, everything goes back to normal and both show up until.... they don't. I go back and forth between scenes a lot. I also have an unoptimized and needs it atlas (trying to finish this first). I wonder if either of those might be the cause.