For what it’s worth, I have the same problem. I don’t have any rules in my WP-generated .htaccess file which support %page_name%. I’m not quite sure how to do these manually, but I can probably figure this out. Maybe.
If I ever have to fiddle with my permalink structure in the future (unlikely), it would be really nice if WP took care of that kind of thing automatically.
Is this something that’s occuring only for some people and not others, or is it widespread?
