I can't seem to disable text-selection in webkit browsers when using jQuery UI .draggable(). I've tried using the webkit specific css (-webkit-user-select and -webkit-user-drag) in various combinations but haven't had any luck.
Here's a jsfiddle where you can reproduce the problem: http://jsfiddle.net/dmosher/8ZGLR/
disableSelection is your friend here.
You may want to create a helper so it looks obvious that something is being dragged.
Updated demo