What am I supposed to see when looking at that file except some coloured sprites?
Scaling is still set to letterbox..
All events are crossed out and nothing has behaviours attached..
My suggestion was using anchor behaviour, but I see no reference to that, neither do I see any events using the viewportleft etcetera..
I'm not sure what you expect this layout to look like in the browser, so without any further explanation I'm at a loss..