Can't login with second user account

I set up two useraccounts. One for me and one for my wife. I can acces the drive using my account on both our laptops (MacBook Pro and MacBook; Snow Leopard) but on both laptops it refuses acces using my wifes account. I checked and changed the password multiple times and double checked setting in basic and advanced mode, but nothing resulted in acces for my wife’s account. I even deleted her share and account and setup a new one but no succes.