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1.3 Beta - not honoring culture when reading XML comments
And it seems that Shazzam doesn't respect the locale when parsing the default values from the FX file's XML comments. My Windows 7 is German and therefore the default decimal separator is a "," and not ".", which is used in the samples.
Per default the current culture is used by .Net when parsing numbers. It should work right with an invariant culture:
For example the ParametricEdgeDetection.fx contains this:
/// <summary>The threshold of the edge detection.</summary>
float Threshhold : register(C0);
But the Shader Settings is initialized with 5 as default value: