I had the same problem all day yesterday and gave up in the end. No doubt that the PCA staff were trying to sort out a few faults on the new set up. It was the same on both IE8 and Firefox. So just a matter of waiting to they get all the problems sorted out.
Microsoft Lumia 950 vs Lumia 950 XL: What's the difference between Lumia 950 & 950 XL?