Don,
Thank you for the post but I think we still have a problem with this.
I agree the SilverlightProjNet.dll is in the Silverlight Edition\Client folder but it does not exist in the Silverlight Edition - Strong Named\Client folder and if this file is the cause of the FileIO exception error reported by the SuiteNetTopologySuite then I think it's omission may be the cause. I could be wrong and this may be an incorrect assumption.
Take your normal sample solution and sign the assembly using a pfx file, I used our normal .pfx file that we use for all our code signing. This then requires you to remove the references to the assemblies from the Silverlight Edition\Client folder and add the Strong Named equivalents. Open the DisplayASimpleMap.xaml from Samples\Getting Started and the designer crashes out with the error:-
System.IO.FileNotFoundException
Could not load file or assembly 'SilverlightNetTopologySuite, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f580a05016ebada1' or one of its dependencies. The system cannot find the file specified.
Could I ask you to take another look and see if you can replicate this behaviour?
Thanks & Best Regards
Graeme