I just upgraded from 3.1.0 to 4.0.2 following the upgrade steps and all went smoothly.
I restarted the server and can log in as a guest. All my configs are there and I can see all three of my build agents however, the admin username and password is no longer recognised when I try to use it.
I have searched for a solution to this and found an hsqldb fix but I am using a mysqldb. I have also looked in the mysql database but the passwords are not stored in clear text (luckily/unluckly)
I really do not want to scrub the teamcity data directory!
Can anyone help me out.