Hi Ren,
I have exactly the same problem. When I use the font DigitalStrip 2.0 BB it displays correctly on my screen but I am unable to preview, I just get a black screen, or publish. If I change the font to Arial for example then I can preview and publish.
Turning Modern Text off does then allow me to preview and publish with DigitalStrip 2.0 BB. However, turning it off changes the text positioning in the text box so means I need to review all slides to see where the text is no longer positioned correctly.
Looks like Modern Text has issues with some fonts, it would be good to have a list of problem fonts as I have spent many hours discovering it was a font issue and then finding this post.
Many thanks
Andy