I had created a custom "not found page" and uploaded it to root of server, named it as "notfound.htm".
This custom page loads fine in Firefox when double-clicked.
But it doesn't load up whenever I typed "mydomain.com/anything", not even after inserting "ErrorDocument 404 /notfound.htm" in .htaccess.
Instead, I get redirected to a random page in my web site, though I do get a 404 Error Notification in WPMU Dashboard.
Atahualpa's default "Page Not Found" page also doesn't load up.
Tried clearing the default "CONTENT IF NOT FOUND" code under ATO>Center Column>Style & Edit Center Column, still no joy!