Stories are Blank

Hi, I just started using Twine 2. Every time I Publish to File, the resulting story appears blank when I open it in Chrome or Safari (on Mac). The actual HTML appears to be intact, but nothing shows up in the browser. I've tried both the desktop and browser versions of Twine, and I have no problem playing the projects in Twine itself.

Does anyone know how I can get these stories to work on their own?