Source Fields Never Load in Update/Insert Block

I am creating a mapping between a MySQL database (source) and Microsoft Dynamics (target).  When I open up the Update/Insert Block to map the fields, I get loading messages for both the source and target fields but I only ever see the target fields.  The source fields are not displayed.  I know that I can access the source as I have tested the connection and the data appear in the Preview of the Query Block.  Any help would be appreciated.  Thanks.

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