Our previous version was 1.574 and everything works fine.
We have tested the latest version 1.593 in our ACC and the CSS is broken.

On Chrome v39 - Everything works fine when we are not logged.
On chrome v39 - The CSS is broken when we are logged.
On IE9 - CSS works better than on Chrome but style broken with the tab pane.

It seems that's everything is ok on Firefox.

I think that the error comes with the style "element.style

applied on

<div id="main-panel" class="col-sm-15 col-md-17 col-lg-18 col-xlg-20" style="width: 1555px;">

For me , the main-panel.jelly is OK but CSS from responsive-grid.css or the Javascript are in charge of this error.

Thx for your help