TonyAguila

All these steps but you failed to suggest the most obvious solution to font problems, as a first recourse, anyway. Whenever I get the “greeked” text problem, the first thing I do is to clear font caches. Of course, I almost never use the Font Book app since I have close to 10,000 fonts in my library. All of the third-party font management applications should have a utility for clearing font caches, but the average user can use a system maintenance app (e.g., Onyx) to perform the operation.

You should also know that you need to restart your computer right after this, so I suggest saving open documents and quitting all running programs before clearing your fonts cache.