Update: 1) Seems / only has an internal error when authenticated. Otherwise it works fine. 2) I don't have an IE browser handy but BrowserLab started working

Update: 1) Seems / only has an internal error when authenticated. Otherwise it works fine. 2) I don't have an IE browser handy but BrowserLab started working fine with all the non IE browsers so it Looks like the site is having issues with IE. I expect it is just a temporary issue though as there have been a number of other bugs that Google has been working through with the launch.