You might need to switch to wallet mode, you might be trying to log in with the password model.

Yes, It will work infinite amount of times. After recreating just make backup so you can load it in such a cases.

I found a wallet I forgot I had.  I regenerated it using a brainkey.  After closing the wallet I tried to log back in but I get a message that my password is incorrect.  But it is the same password I used when I regenerated the wallet and I used that same password to make some trades after recreating the wallet.  What should I do?