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Illustrator CS4: Keystroke to initiate auto-dupliaction - how to deactivate?

I seem to accidentally initiated an automatic duplication setting, so that anything I drag duplicates as if I've also hit the Alt key - and I can't find how to undo it! Both the Selection arrow and Direct Selection arrow do this.

A quit/restart has no effect.

Been using Illy for 8 years and I've never seen this before, but I've done it amidst frantic keyboard shortcutting!