Found a bug in version 2.6.beta3. All posts will give 404 error when site uses “index.php/%postname%/” permalink structure. Also tag and archive pages will give 404 error. Normal pages are still working OK.
With 2.5 there was same issue for pages (posts were OK).
I have just upgraded to the final 2.6 and have the same problem… setting the permalinks to the default returns the functionality but is quite inconvenient.Every other permalink structure returns 404’s.
Otto, that work around is a pain in the butt for people who have been using it, plus a major problem for the search engines who are going to see all the pages as having disappeared or been removed from the site.
I am amazed that something as simple as this made it out to a release version.