Yes, I've tried all the advice in this thread and many other threads on this forum. It's ridiculous that you would even need to go into your time and date settings to get a video player app to work. Especially a video player app that is needed to access content which is paid for (and paid quite a lot of money for!). Why can't Sky have a service like iPlayer or All 4 which avoid these issues?
In the end, I followed the advice on this forum which seemed to do the trick, although whether it is a robust solution is another matter: