As Wade said, I don't think this is any bug. sounds mor like you are using some sort of hyper-sensitive input device (or misconfigured one) that causes accidental selection and move of existing work.
I've experienced this issue if I drag a pic from my web browser directly onto my artboard - it scatters any existing artwork. If you first drag the pic to your desktop, then to your artbaord it does not do this.
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