Have had the same problem over the last couple of days only on my Mac though!
IE on Windows works fine, but on both my Mac Pro and iPad I'm having this issue.
EGIT got me to reset my Safari settings but has made no difference. Seeing as this is now affecting many people and many different Mac products, I can only assume that they have updated something from their end and it is conflicting..... When I asked the IT guy that, he went very quiet!!
