@idanissen this continues to be a major issue. I have sent two emails with multiple screens shots and was advised that they are working on it. I have not been able to find a rhyme or reason behind why some fonts are rendering better than others. I'm am currently building two new sites and using built-in fonts. Sometimes they show, sometimes they don't...even on the live sites—not just edit mode. Support advised me that if you select a different font, then save, then select the desired font, it sometimes will hold. I've only found this effective 50% of the time. 😞 Initially I was told that it was an Adobe font issue, but I have used Google fonts, too and have the same issue.
@paul2009 have you noticed this issue across sites? This is independent of the !important CSS issue, but rather normal SS fonts, not loading.