If you have issues loading your Silverlight controls and it does not give any clue on possible error, you should check IIS settings to see if MIME type is configured correctly for Silverlight. IIS 6 does not have this configuration and you would have to add MIME type manually in IIS.

Click on MIME Types and register a new MIME type as shown

For higher IIS versions check whether or not this is already available in the list of configured MIME types.

Set MIME type for Silverlight

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