This is sad, but after several years with WordPress, and transferring from wordpress.com to wordpress.org in order to use the fancier themes and widgets, I have now spent 5 days trying to fix the problems which have arisen since upgrading to 3.1
I cannot login. I have posted several times, and got the same advice. I have tried every fix suggested. I have reinstalled manually. I have asked my Host to investigate. I have tried all the resetting of password suggestions in the codex files.
The problem has been narrowed down to something in the WordPress module which is resetting the passwords to something that is NOT MD5. So nobody can login.
If I don't get this fixed within 24 hours I will have to move elsewhere.
If somebody could advise me how to attract the attention of a WordPress programmer who could actually figure this out, I would be extremely grateful.