rlange - 3:13 pm on Aug 6, 2012 (gmt 0)
rain - tried that out just now, and the 404 page shows, so at least that's all good.
There's something about or around 'header("HTTP/1.0 404 Not Found")' that's throwing the spanner in the works.
That almost sounds like the "headers already sent" error. Is there any previous code setting headers and maybe using