As of yesterday, the "remember playback position" function in iTunes has suddenly stopped working. The files still have that option ticked, but whenever I go to a file, it returns to the start. Since I only use iTunes for audiobooks, this is something of a problem. I cannot see any other settings that could be relevant, and I've tried it with different files and also with a slightly older copy of iTunes. What can I do? I'm using Windows 7 x64.