Within the past few days, I've noticed the program doesn't backup at all. I've had it set to do automatic backups for quite awhile. The last successful backup was on March 18. I tried setting it to do "manual" backups, but had no luck. On my home screen (after logging in), the "back up now" button is grayed-out. I share the account with two other people. Between the three of us, 21.97 GB of 75 GB have been used. I seem to recall this happening before, but can't think of what I would've done to fix it. I'm using Mozilla Firefox 11.0 on Microsoft Windows Vista Home Premium Service Pack 2 32-bit. What might be wrong and how do I fix it?