The passthrough redirect itself works just fine (ie the correct page data loads)
BUT the page loads as though the user is not logged in. (ie, no admin bar, and specific page data doesn't load because it depends on login status)
To clarify, the redirect itself is not login based, just the page data and site performance is. When navigated to directly, the the page works just fine. Refresh simply reapplies the redirection - no change. Clicking on a link from the page (away from the page) prompts the return of the admin bar without requiring the user to login in - I'm assuming because they were always logged in, and further assuming that the redirection is causing a miscommunication somehow.