I started to have exactly the same issue since yesterday, and I spent 1 hour with support desk today. They directed me to try everything, including re-install the entire Profile. The issue was resolved for a few hours, and I started to get the same issue all of a sudden now. I tried the way you described to uncheck "save prompt" box - now it doesn't freeze when I save the return. However, it seems that cloud backup notification window no longer pops up. Does that mean cloud backup is not completed? Thank you.