The problem : for some reason Trebuchet stopped working and we could not use it for Cyrillic texts and cannot be used to create Cyrillic fonts.

The solution that worked for us : we’ve checked all the versions in Fontbook ( close Fontagent Pro if you are using it ) and noticed that there are duplicates. Checked which from the duplicates are actually working with custom cyrillic text preview (top menu > preview > custom ). Turned them ON and deleted the rest. Trebuchet family was back in the game 🙂

Note: we’ve tried to use Fontagent Pro and it wasn’t showing the custom text preview correct. It appears that one should use only Fontbook when there are issues because after all – Fontbook is the build-in Mac font manager…