I am glad to see that I no longer get to see the warnings in my Silverlight 3 project but the fix is not 100% correct. I am referring to this issue:
Because of this fix, ReSharper gives me no warning at all. For example:
<navcore:UriMapping Uri="PublicationManager" MappedUri="/Views/PublicationManager/Default.xaml"/>
In the above example the MappedUri does not exist and ReSharper should show a warning as it did before. The issue I had was that ReSharper was also complaining about the value used in the Uri attribute. IMHO ReSharper should still check the values in the MappedUri attribute because these uris should exist.