I am trying a basic public-accessible website and built one page to just display info that uses the standard controller, great, it works fine.

I then wrote an extension to get the related objects necessary, and it still works, UNTIL I try to actually USE one of the public variables (they have just a standard get and set) in the VF page.  I get the following error: 

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I have checked and under the Public Access Settings for that Site, I do have the Extension available.  I also checked and have given that profile Read access to the objects I access in the Extension.

Any help on debugging this further?  I can't figure out how to even do a System.debug on a Site, it's in my Extension to see if we ever get there, but I don't know how to get this to show up on the System Log :-(