Blog/corporate starter frontends show blank page in browser

Hi everybody.
New here, new to Strapi. Like what I see so far. But having trouble with the starters. Have tried Blog and Corporate (v4). All installs fine, admin and frontend start in Terminal fine. Admin loads and works fine in browser. But the frontend of both starters just shows a blank page in browser. No error in console, no response at from localhost:3000 (localhost returns 200, favicon loads).
No errors to speak of in Terminal.
npm run build / npm run start also run okay, build appears to create a working version, but again nothing appears in Chrome, just a white page.

By the way, exactly same thing happens with npx create-strapi-app@latest my-project from Strapi homepage.
Any help appreciated.

Thanks
Ben

  • Strapi Version: 4
  • Operating System: macOS 11.6
  • Node Version: 16.15.1
  • NPM Version: 8.11.0
  • Yarn Version: 1.22.18