For a moment I panicked because I was unable to login in this account for the whole day D:
Marti's account, from the same computer, was working just fine but when I tried to log with mine it always said to me that the password wasn't correct.
I tried to reset my password but it didn't work. I also tried to delete all the cookies and stuff and re-install firefox or try to login with chrome...but nothing! D:
Then I went to a friend home and from her computer Da let me log in correctly.
At this point Marti deduced that it was probably an IP-related error and I decided to write this journal in case someone develop the same problem in the future.
The solution? Just turn off your internet connection from the modem, wait a little and start it again.
It will make you login again
I hope this might help if someone end up in the same problem ^^