OS: Ubuntu 10.04.1 LTS, Passwordsafe: Linux 0.3 (3839) beta
When I edit a password entry (e.g. the URL or Notes), I get a "passwords do not match" error.
If I click "show password" before hitting "O.k" to save, it works and the changes are saved (without changing the password).
In the Windows version, I edit the entry without displaying the password.
IIRC, this was also possible in 0.1 Linux beta (but I am not sure about this).