Hi Kel,
I don't know if this will work for you or not, but I updated this a couple of months ago to resolve resizing of the object with the browser.
I initiate jQuery (as a failsafe) on the slide when timeline starts, then I set this to start at .25 seconds (to ensure it's loaded). Again - not ideal by any measure - but I guess better than webobjects that look like an amateur overcompressed them :).
var initStage=$('#slide').width();
var initObjWidth=$('.slide-object-webobject').width();
var initObjHeight=$('.slide-object-webobject').height();
var webObjWidth=(initObjWidth);
var webObjHeight=(initObjHeight);
$('.slide-object-webobject').css({width: webObjWidth, height: webObjHeight});
$('.webobject').css({width: webObjWidth, height: webObjHeight, transform:'' });
$(window).resize(resizeInteraction);
function resizeInteraction(){
var stageWidth=$('#slide').width();
scale=((stageWidth-initStage)/initStage+1);
var webObjWidth=(initObjWidth*scale);
var webObjHeight=(initObjHeight*scale);
$('.slide-object-webobject').css({width: webObjWidth, height: webObjHeight});
$('.webobject').css({width: webObjWidth, height: webObjHeight, transform:'' });
}
I mentioned before this could be written in pure javascript (safer), but I keep hoping there will be a native solution. Perhaps your issue will give this a little bump and their devs can look to see what I'm doing here - which is to scale using more precise values since the percentage method doesn't seem to get precise enough (I want to say it rounds or something) and if something is just like one pixel off from "perfect" from original, images can look blurry (I run into this in regular images as well, actually - it's especially evident on system screens - they never look as clear as the original).
Fingers crossed that helps or at least points you in a direction to a fix.
Best,
Lisa