Duplicate of UE-14404
A user complained that a font was not showing up in their project. While investigating this issue, I found that certain fonts will cause the project to no longer work when launched to FireFox. The browser throws an error and then refuses to actually play the project.
Custom fonts that work in the example project provided:
Fonts that don't work:
Head over to the existingAnswerHub thread and let us know what's up.