Having the same issue here also. Tried it on three devices, iPad Air 2, Windows 10 work laptop and my personal laptop with windows 7 all running latest updates for their OS. Tried all the latest released of Chrome, IE and Firefox. Have attempted clearing browser history and even reset browsers to deafult with no success.
It had started yesterday evening for me when I kept getting kicked out of the website and would have to log back in again which continued to happen for about 30 minutes and then when I finally got the website to stay logged in it wouldn't let me click on any caches on the map. I have also changed the map providers in case it was an issue with that but still no joy.