Verified 08/24 BG
If your Mac's Safari browser is showing ??? with a square instead of regular fonts, then you should:
1. Try restarting your Mac. Very basic but always a first try.
2. If it still doesn’t help then go to Applications --> Font Book--> File--> Settings -->Advanced
3. You can also “Validate File” from this same menu to check for errors. After doing this, again restart your browser or your device.
Still not fixed? Please submit a help ticket and your tech will take a look for you.