Here is how to reproduce the problem in a simple code snippet through the public API:

	protected override void OnInit(EventArgs e)
	{
		ScreenRanges customScreenRanges = new ScreenRanges();
		customScreenRanges.SmallScreenSizeRange = new ScreenRange(0, 100);
		customScreenRanges.MediumScreenSizeRange = new ScreenRange(101, 200);
		customScreenRanges.LargeScreenSizeRange = new ScreenRange(201, 300);
		customScreenRanges.ExtraLargeScreenSizeRange = new ScreenRange(301, 400);

		DeviceScreenSize screenSize2 = Detector.GetScreenSize(null, customScreenRanges);
	}