Lost Pasword password doesnt work.

[NJ5]

I had this problem and it turned out that the solution was:

1- Use the "lost password" button
2- Try the password which got sent to your email (it's different every time)
3- Try to login. If the password didn't work, go back to step 1

After a few repetitions, the received password finally worked, and I was able to use my account again. I guess you should contact ioi first though, maybe he can solve your problem better.