My browser has suddenly started changing to https://dub126.mail.live.com when I sign in to my Hotmail account on any device - Macbook/MBAir/ ipad/iphone and I cannot open attachments.  I get a message that Safari cannot verify the identity of the website "dub126.afx.ms" or it simply does not open.  I have tried in Firefox and the same happens.  I can forward my emails to someone else and they can open the attachments on the same device so it is my email account that appears to have the problem not the device.  HELP PLEASE.