Just had my 3rd HD box installed - initially I was pleased to find out that it is a new Pace box but there is a significant lip sync problem which cannot be resolved with optical delay (only on HD channels). SD is fine. I spoke to Sky and was told that "a lot of customers" have complained about this and they "are working to fix this soon". In the meantime Sky have agreed to credit me back my £10/month HD sub until it's resolved. Is this really a big problem? How many of you are affected?