It’s as the title of this question says : even though I log in with yahoo, I am never notified about anything at all (answers or comments to my questions, even when I put them into my “favorites”). Perhaps this problem is related to my being unable to log to any chat room (I asked about that here too and nobody could find a solution).
I come from MathOverflow and I remember that in comparison the MathOverflow system worked fine for me, it always notified me about the things I wanted to know and nothing else.
I never worried much about this, but the most tiresome aspect of my problem is missing a comment on one of my answers.
Perhaps I should create a new fresh stackoverflow account and leave my current, dysfunctional account.