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Hello,
I'm developing WP 8.1 Silverlight application and I have problem with MultiResolutionImage control. When I launched application on a 1080p device it crashed with the following exception: "InvalidOperationException: Unknown resolution type". I think that this problem is caused by Application.Current.Host.Content.ScaleFactor property, because on a 1080p device it returns 225, and in WP 8.0 application on the same device it was returning 160. This scenario can be simply reproduced in WP 8.1 Silverlight project on both Windows Phone 8.1 1080p emulators.
Best regards.