To my friends using PI Square. I believe I answered my own question. For the benefit of those who encounter this thread here is how I resolved it.
In PI System Explorer I changed the source tags to a different PI Server thinking perhaps the problem I was encountering centered on the PI Data Archive (a.k.a. PI Server) I was using. It turns out I was right. I created duplicate tags on an alternate PI Server in the same domain and then referenced the new tags in the Elements / Attributes and voilà it worked.