The issue is Chrome been displaying special characters and all asian characters with a question mark.
The solution is related to Adobe Creative Cloud loading its own copy of Open Sans via Typekit.
If you have Creative Cloud installed, try following these steps:
1. Click the Creative Cloud icon in the OSX menu bar.
2. Go to the Assets tab, then click Fonts.
3. Click Manage Fonts, which opens a browser window.
4. Find Open Sans and click the Sync button next to it.