Incorrect login credentials after 2.00 upgrade

Hi,

I have a problem. I pass the installation (upgrade from 1.90 to 2.00), I think I did everything. Application is working fine (frontend), all data looks fine.
But I have a problem with login credentials. I tried to compare data in Customer table with old table (Nop_Customer), and all is almost the same (like username, passwordhash...). I tried to register myself as new customer, I typed the same password as before and what? Password hash in the table Customer is different.

Does anyone some idea why, or any solution?

Thanks
Marek

I found it:

Configuration -> Settings -> Customer Settings -> check 'Usernames' enabled to true.

And than, credentials works fine.

Thanks