Just upgraded to WordPress 3.0 from WordPress 2.9.2, but the upgrade is with broken features. What I mean by this is that I had enabled multisite by following the instruction here and here to the letters, but it turns out when I added a new site using subdirectory method, click on backend and visit links of the new site, I got a broken backend and a broken front page of new site. Backend of the new site showed up as page not found, and front page of the new site showed up without a working css or a template. Please check the images that I link here to see what I mean, check it in order of numbers.
How do I go about and fix these problems?