https://www.dotnetzone.gr:443/cs/blogs/softwarebytes/archive/2011/02/14/agatha-rrsl-wcf-and-collection-data-types.aspxThe devil is in the details. Read the documentation of every library you use. Reason about your code. I have been recently refactoring and reviewing code of a project in order to move it from WPF to Silverlight. (I will make a series of posts on the troubleelCommunityServer 2.1 SP3 (Build: 20423.1)