I don't know. I'm not very familiar with ASP.Net. MVC is a different story.

>Do you know what is the purpose of the following line in the "body" section of the Site.Mater in the asp:ScrptManager:
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><asp:ScriptReference Name="jquery" />
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>If I remove this line the Mask works. Once I put it back, it does not.
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>UPDATE. It is not consistent. I need to get away from this problem; for the time being or for good.