Almost the same question here;
I use Opera, the latest version now as it updates it selves. (hard to find the installed version exactly)
After creating a new BBC Sounds account, Opera stored the new login password.
Every time I open that site, I have logged in with my e-mail address and the password.
When I check Opera under Autofill Passwords Saved passwords, there are passwords stored, but not the new BBC Sounds account.
Hope someone can clarify this.