Test doesn't quit even though no network activity any more

[Stephen]

I executed following scripted test. Visually I can see all of steps are executed, but after last step, the test hung up for quite a while and didn't quit. And in result it says timeout, but in waterfall details result view, there's no step/figure showing where it times out.

The last step is just simply selecting a different color icon for a product display. I don't see it will wait for any network data but an image.

logData 0
setEventName firstShoe
navigate http://global.ecco.com/en/collection/lad...9013-55294
logData 1
setEventName selectBlack
execAndWait document.querySelector("img[alt='ANGEL'][data-variant-id='51052']").click();

For the test on public instance for this, first view is always okay, and repeat view has this timeout issue. http://www.webpagetest.org/result/130710_GK_68X/
For the test on my private instance, both first view and repeat view always time out, even though I don't see what it reallys waits for.

Same issue happens on another script as well. After executing the last step scrolling down the page, the test hung up until timeout which doesn't look like waiting for network pkg, at least shouldn't be the case for repeat view where all data are cached and result time are all 0.

logData 0
navigate http://global.ecco.com/en/collection
execAndWait document.querySelector("div.catalog-menu>ul>li>a[title='Ladies']").click();
execAndWait document.querySelector("div.catalog-menu>ul>li>a[title='Flat Shoes']").click();
logData 1
setEventName scrollDown
execAndWait window.scrollBy(0,10000);