The position plugin can yield wacky results in webkit, if zoom-in or zoom-out is used.

To reproduce, go to the Position demo page http://jqueryui.com/demos/position/ with a recent version of Google Chrome or Safari. Zoom-in a couple of times with View > Zoom-in, start moving around the parent element to see the positioned elements, it will be pretty obvious that they are off centered

Has anyone encountered this?...been banging my head on this one...needless to to say workaround suggestions are appreciated!