Check your computer for a key generator.
Read the security thread in this forum if you get the chance.
I dont see anything on this end but I will monitor your account. Download this utility (its free). Run it, delete anything suspicious and then reset your password afterwards.
(there is an option on the profile page that allows you to receive emails for replies to your posts. If it is checked you will receive replies. Obviously it has been changed from unchecked to checked.. Does someone else have your password?)