When I click on the Preview as Admin link it goes to http://myorg.force.com/page. However I want to go to http://myorg.force.com/PlacementPreferences?id=a0C8000000BFLng

Maybe my default behavior for Preview as Admin is doing something different than what should be happening. I don't see a list of all site pages when clicking preview as admin it just redirects to a page.

I tried using the debug log on the public sites user however it does not give any detail as to what is causing the Authorization Required message. I have a very strong feeling that it is related to a view permission that is lacking in one of the objects that the page is attempting to access.

I tried replacing the internal VF page code with a text string and still getting the error which must mean something in the custom controller I am calling (which the Site user has permission to see) must be doing something that the Sites user is not permitted to access.

I had a similar symptom which turned out to be DML that I was trying to run in the constructor, however that is not the problem that is happening here. So I am trying to figure out what I can do to get more clarity on the issue since Debug Logs and viewing the Visual Force pages directly don't shed any light on the problem.

Currently I am trying to work with this tutorial to see if it tells me a bit more about what might be going on: http://www.tgerm.com/2010/10/debugging-sites-authorization-required.html

So thats kind of where I am at. I probably should be posting my controller code, but really want to know how to debug this issue better as I seem to experience trouble with permissions when creating Sites pages often.