I think you’re trying to view the form while logged in on the same
browser. please note this is default configuration of Pie-Register, it
doesn’t allow logged in Users to view the forms however, you can change
this on General Settings page of PR.
Actually, that is another plugin. I could not get it tot work, even from another browser. None of the pages worked with my own custom theme. They do work with a standard wordpress theme, so I am guessing my theme is missing something… I just don’t know what.