:smileyhappy: IT IS SOLVED!!!
I received the 3rd EA6500 (a new version2) and it had the exact same problem of a Hidden Network. I finally found a solution after much seaching on Google. The EA6500 has a feature called "Single Tap" that allows using a thing like a credit card to tap a device to add it to the router. I set that feature to "Off" and the Hidden Network went away. I wish the Linksys Techs would have known about it. At least I got a new version 2 to replace the Refurbs.