Hi MooTools, I've encountered a bug where IE6/7 doesn't recognize a draggable object if the opacity is set to zero. It seems IE will ignore mouseover/down/click/etc properties if the opacity is set to 0% regardless of display or positioning.
Anyway, not sure if this is a fixable problem or just something that will have to be accepted as an IE problem. For now, the problem is solved by setting opacity to 1% (0.01) which is generally unnoticeable, but I wanted to report the bug. (Reasoning for doing so is to enable a user to drag an invisible handle which intuitively moves something else...)
