Cant check voicemail online

When I go to https://businessvoice.comcast.net/ and try to sign on a pop up screen comes up tells me there have been some changs that will create a new online experience and I click continue and nothing happens.  I've tried it in Firefox and Explorer. I've restarted my system and I've double checked to make sure I am using the correct voicmail password/security code. Still doesn't work.