I've written a custom attribute that implements IDataContractSurrogate that determines the type to serialize/deserialize in place of 'legacy' types from configuration information. The code was developed on a Windows XP box and works great under every scenario I've thrown at it. Thinking I could call it a day I deployed the solution to a Windows 2003 Server box that has all of the necessary runtime redistributables and patches (but no VS 2k5) installed and ran a few test against the service. Much to my chagrin, nothing worked except those types already defined with a DataContract/Serializable attribute. I went back into the code and sprinkled it with magical pixie tracing dust...the only trace statement written was a stack trace I placed into the constructor but no others appeared. On my XP box ALL of the trace statements were hit.

So my question is: What dumba$$ thing am I overlooking here? Is there some security setting, code access attribute that I'm missing?

Help me IndigObie-Wan-Kenobi...you're my only hope...