Unreadable font on Gmail since recent updates in Chromium
I had a similar issue with Google Chrome and Outlook.com (I know different site & slightly different browser, but the code should help). Adding this code to ~/.config/fontconfig/fonts.conf
(it may need to be created) fixed the issue for me:
<match target="font" >
<edit name="embeddedbitmap" mode="assign">
<bool>false</bool>
</edit>
</match>
This isn't original with me, but I cannot remember where I found the answer as it's been awhile (I just copied my file to here). All I remember is that my searches had to do with Calibri. Hope this helps.