Try wrapping another div around the #Stage div. I believe the scrollbars are appearing because with the script Animate will recalc the parent height, BUT if that parent is the body it doesn't adjust so it thinks it's the original height of your composition. So your HTML page will look like this:
<div style="height:1px; overflow:hidden;">
<div id="Stage" class="EDGE-78729757">
I found I had to apply the height property to get it to hide the scrollbar, but the value is irrevelant as it gets overwritten anyways by the script. Give that a shot.
Your solution works !
A LOT !
Cool, glad to help!
I've run to this same problem with the current version of Edge Animate (2015.0) and this solution doesn't seem to be working anymore. I'm using the built in "Responsive Scaling"-setting.
This time the only problem is Internet Explorer, other browsers work even without this fix.