Jesse,
Problem is not script debugging. websites try to deternime browser version before loading the content. in our case since we cannot specify UserAgent attributes for WebView control - youtube is unable to determine browser version and hense its
standard verification scripts are failing. Capability for us to specify UserAgent so that websites can determine that we are running IE10 under Metro Environment and execute well.
In this eample, if i browse same page in metroIE it is loading HTML5 content rather than flash content but in my case it is trying to load flash content and failing. If wesite had a problem, it should have failed with MetroIE as well correct?