See above -- PasswordMaker does not store that option's setting. Whenever you close PasswordMaker and open it again, the generated password is shown in cleartext. I've experienced that Bug with PasswordMaker 1.5.1 both on Debian Stable and WinXP with Firefox 1.5.0.1 and 1.5.0.2.
Besides that it's a really nice tool. :-)
Kind regards
Jan