Preloader no longer centred

Hello,

I built my site a while back on edge animate 3.0 and it worked fine. I've recently I have come back to update some bits but a few things no longer work.

My preloader is no longer centred to the stage. I have a 100% width stage so I used absolute positioning and auto margins to centre the preloader before, this was the snippet of code on my Preloader actions

     $("#preloader").css({

        width : '120px',

        height : '120px',

        margin : 'auto',

        position: 'absolute',

        top: 0, left: 0, bottom: 0, right: 0

     });

This no longer works, is there anything I need to change on this code?

Or anything I can change in the HTML file which is being displayed as follows:

      {

            id: 'preloader',

            type: 'image',

            tag: 'img',

            rect: ['0px', '0px', '120px', '120px', 'auto', 'auto'],

            fill: ["rgba(0,0,0,0)",'images/Loader.gif','0px','0px']

      }

Thanks in advance,

Nick