answer:When you let people upload to your server there are always security risks, but as far as I know there are no extra security problems with the system you mention. At a guess, I’d say it is just harder to implement. I used to be a developer, and while I did it for a few years professionally and knew enough to make all kinds of sites, I would have no idea where to start if I wanted to create a drag and drop uploader. It would no doubt take me a few days to figure it out. As for IE, no doubt it has problems with them, but IE also has problems some times understanding even the most basic of HTML code, so no surprises there.