In the last week my password changed without my knowledge, the name of my computer (just one of three) listed with Mozy changed to one I don´t recognize, and it appears none of my backed up files are listed on the Mozy website. I get error messages 1 and 5, and nothing is working. Very strange, and a little disconcerting.
I can only assume someone may have hopped onto your computer and you likely had auto-fill enabled on the machine. I am not sure but only speculating (This is a common way for people to gain unauthorized entry).
But at this point it is prudent that you change your password immediately. Also if I may suggest cleaning out auto-fill on your computer and locking it often when you step away.