I have recorded some vocal tracks and made some changes with melodyne no problem's, I have just gone back to that project, and found that the region fx melodyne are muted and the untouched vocal track when editing with melodyne wont allow me to use "correct pitch" or "quantize" also if I move the blobs the shoot up, even if I record a fresh track it still won't work. melodyne works perfectly in all my other projects, any clues to what I have done.