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Publish a site with any text and styling and Xara adds the CSS coding into xr_fonts.css, xr_main.css & xr_text.css. Roughly:


The first handles things like Google Fonts.
The second is for...

No one has ever told you to clear your Cookies or Passwords just your cache.

If you update, review and publish to a server, the server will be caching things too.
Do check there befoe lampooning...

You didn't initially advise if it is not working with those browsers to the actual live site.
If so, there is a server cache there as well.

Do you use Cloudflare?
Here is a Thread I worked on...

Still sounds like a caching issue - browser or server is for you to nail down.

Acorn

​And with Ctrl+F5?

Acorn