I did a fresh install of Wordpress MU 2.6.1 (on Linux 2.6.9, Apache 2.0 and MySQL 4.1.20) using sub-directory option and the installation was successful. I got an email message letting me know where to login and the default admin id and password. But when I tried to log on, the page simply reset itself and provided me with blank fields again. I tried all tips outlined on this page below but to no avail.
http://codex.wordpress.org/Login_Trouble
I appreciate any help you could provide.