I recently upgraded to WPMU 2.8.6 and ever since, my users can't log in on their individual blogs, but they can log in from the main page. My site is at blogs.mtwp.net (we're a school district). So if a user goes to blogs.mtwp.net/BLOGNAME/wp-login.php, their password is rejected. If they go toblogs.mtwp.net/wp-login.php, they can log in and get to the dashboard from there. But it's not all users. Site admins can get in just fine. We're using wpDirAuth 1.4 if that makes a difference. Honestly, I'm stumped. Any help would be very much appreciated. Thanks!