I cannot reply to any of my messages

This has been happening for at least a week. I used to just hit reply or reply all and the sender's name and topic would be filled in, along with the message I'm replying to. Lately, I get a blank email form, no names, topic or message, and even if I hit the "To" button to pull up my contacts, I cannot access my contacts ... nothing happens. I use Firefox and have not previously had a problem. I noticed the display for my Contacts has changed. Does this have anything to do with it? Are you updating the way Hotmail works?