Sometimes with a multi-store or a multisite you have missing icons (fonts) or similarities.
If you get this error:
Font from origin ‘http://www.domain.com’ has been blocked from loading by Cross-Origin Resource Sharing policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://sub.domain.com’ is therefore not allowed access.
Add this to .htaccess file from www.domain.com and it will work again.
Header set Access-Control-Allow-Origin "*"