Some websites have been doing something new with the user signin\login box. Instead of presenting a signin\login box on the main page or providing a link that will take you to a signin\login box, if you mouse-over the signin\login "link" it does this neat little "drop-down" affect. The trouble is, you have to keep you mouse in that area or the "drop-down" goes away. So, you're entering your signin information and you accidentally bump your mouse; bye-bye signin box and now you're typing into nothing and don't realize it until you look at the screen.