I;ve had this problem now and then for years and have not found a solution for it. Certain documents and certain web pages from time to time display completely in Greek characters. I've tried every different encoding setting that makes even remote sense, and I just can't get teh Greek to go away.
Currently I'm trying to look up something in the SVN book on line, and it's all Greek characters. If I view page source, the characters are displayed in the proper font. Google searches show several others having this problem, but no one had a solution. Someone posted a solution here, but it was redacted for some reason and the only part that makes sense is that I should but a product called Suitcase Fusion. I refuse to pay money to make my Mac stop displaying characters in Greek font at random. In some circles that can be considered extortion.
Does anyone have a solution to this bizzare problem?