I followed the advice I saw in these forums so that I could get the Civ 5 music into iTunes by downloading the Xiph.org Quicktime Component and then sucessfully added all the music to iTunes and it all worked like a charm, brilliant. Then, after several months of flawless performance and playability, they suddenly refused to play last week. I haven't been able to play nor add any of the music to my library anymore. Has this happened to anyone else, have you fixed it and if so how?