I had the same problem long ago, for something like a month, I could not read Whisper, Party or Guild chat, apart from some little moments where the chat seemed to work, and then stopped again, but in my case everything went okay after a bit, so (if it's not a message filters setting thing) I'd just say you to try and wait, some of those issues goes away as they appeared with time... Hope you'll find a solution to this problem, I know how it can be annoying!