I'm really hoping someone can help me with this because it's making me so angry!!!

I am using Illustrator 10. I don't ever recall this being a problem before in v.9, but it's been a while: When I select one object, I am able to drag it anywhere. Naturally. But if I select more than one object, then drag them somewhere, they keep snapping back to where they were.

What is this terrible, terrible preference, and how can I turn it off?!! I'm sure it's something really simple, but I haven't been able to find the answer in any book.

Please help!!!!