I hope you are ok with using the other browsers now. My initial analysis says that it is probably due to the large Google fonts select boxes in the Fonts tab (contains about 500 items). Pls let me know if we need to find a workaround for this. I can just suggest a way to get rid of those extra font selections. Since this issue is currently with Safari only and may get fixed with updates to the new OS, I do not want to make too many changes now. Thanks.