packaged version of ajax_load breaks layouts in certain circumstances

It may have been down to aggregation after all. I'm using the advagg module, and setting inline css aggregation to disabled seems to have fixed things for me.

I continued to have problems with ajax breaking layouts and JS, including with advagg disabled.

To fix this I just had to upgrade ajax_load to the latest dev release, which includes patch #1193578: Emulate theme('page') processing to obtain list of css/js files

Spoke too soon... still get superfish errors, but not as 'badly' as before... it used to partially break the appearance of the menus... but now all looks well, apart from an error message on internet explorer (only internet explorer) when ajax is triggered and only when aggregated. Error is "Object doesn't support this property or method" related to this code:

Drupal.behaviors.fusionSuperfish = function (context) {
  $("#primary-menu ul.sf-menu").superfish({
    hoverClass:  'sfHover',
    delay:       250,
    animation:   {opacity:'show',height:'show'},
    speed:       'fast',
    autoArrows:  false,
    dropShadows: false,
    disableHI:   true
  }).supposition();
};

Also getting Superfish errors on Chrome. Slightly different, again it only happens after an ajax call has occurred and when JS is aggregated. With chrome the error is only triggered when interacting with the menu, i.e. hovering. I get "cannot read property 'hoverClass' of undefined" which is blown up by this div in the page:

<div id="block-commons_profile-image_links" class="block block-commons_profile odd first grid16-0">

Unless Chrome is giving me bogus information it looks the superfish menu is trying to alter elements in the page?

also get "cannot read property 'delay' of undefined" which blows up at this point in the JS:

var sf = $.fn.superfish,
            c = sf.c,
            $arrow = $(['<span class="',c.arrowClass,'"> &#187;</span>'].join('')),
            over = function(){
                var $$ = $(this), menu = getMenu($$);
                clearTimeout(menu.sfTimer);
                $$.showSuperfishUl().siblings().hideSuperfishUl();
            },
            out = function(){
                var $$ = $(this), menu = getMenu($$), o = sf.op;
                clearTimeout(menu.sfTimer);
                menu.sfTimer=setTimeout(function(){
                    o.retainPath=($.inArray($$[0],o.$path)>-1);
                    $$.hideSuperfishUl();
                    if (o.$path.length && $$.parents(['li.',o.hoverClass].join('')).length<1){over.call(o.$path);}
                },o.delay);