WordPress Redirect Specific User. Tired of Peter’s redirect Plugin its not working

Do you require that this user go to that specific page first upon logging in? Or can they go to the regular page after login and then just make them the only user allowed to view the specific page in question?

If the latter, try using the following:

wp_get_current_user();

http://codex.wordpress.org/Function_Reference/wp_get_current_user

Then test to see if it is the user you want. Make a custom page for the page you want (if you haven’t done so already) and add this test at the top of the page. If any other user is logged in (or none at all) then display nothing or use:

wp_redirect( $location, $status );
exit;

http://codex.wordpress.org/Function_Reference/wp_redirect

to redirect all other users to the main page or some other page.

This approach seems (to me) a lot simpler than potentially breaking the normal login functionality.