Hans,
I hope that by now you have learned the correct way to start/stop AOLserver and PostgreSQL. If not, please take a look at their documentation. It's not much of a problem to AOLserver, but it is a BIG problem for PostgreSQL.
When you changed your .tcl file to store encrypted passwords in the database, you made the software also look for encrypted passwords in the database.
Your current users had their passwords stored in clear text, so when they try to login, OpenACS grabs their passwords from the DB "thinking" they are encrypted. Since they are not, the login fails.
If you really want to use encrypted passwords, you'll have to convert all your user's passwords to the encrypted form. Or delete all your users, and ask them to re-create their login (in which case their passwords would be store encrypted).
A quick solution is change your servicename.tcl to go back to plain text passwords.
