I followed the instructions to programmatically add the ad to the page directly from the C#, and the ad is not being displayed in the 480x80 size.
Here is the code:
optionalParams = new Dictionary<InneractiveAd.IaOptionalParams, string>();
optionalParams.Add(InneractiveAd.IaOptionalParams.Key_Ad_Alignment, InneractiveAd.IaAdAlignment.BOTTOM_CENTER.ToString());
optionalParams.Add(InneractiveAd.IaOptionalParams.Key_RequiredAdHeight, "80");
optionalParams.Add(InneractiveAd.IaOptionalParams.Key_RequiredAdWidth, "480");
InneractiveAd iaBanner = new InneractiveAd(App.advApID, InneractiveAd.IaAdType.IaAdType_Banner, 60, optionalParams);
AdGrid.Children.Add(iaBanner);