Seamonkey password problem

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My Seamonkey Portable stores and remembers passwords for various websites -including DC- with no problem.
It used to also do so for a fav website, but has stopped doing so, and never even asks me anymore if I want to store the password for the particular website.
I have to type in my email address and password every time now.
How can I fix this?

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Seamonkey ran a new update after I posted this thread, and the next time I logged into the problem site, Seamonkey prompted me if I wanted to save the password, so the problem got fixed by a Seamonkey update.