Site Title not showing up

This is a beautiful theme. I’ve installed the free version on a development site and am working on building a site for a client, so it is not live yet and I can’t provide a link. I will buy the pro version if I get everything working.

I have entered a site title and tagline, and checked the box to display site title in the customizer, but it is not showing up. If I upload a logo, that does display – however this client does not have a logo and doesn’t want to spend the money on one, so I’d rather just have her site title display.

Any ideas of things I should look for?
thanks!