I'm a developer with no magento experience and we have a client who came to us because their magento admin login stopped working (ver 1.9). I get the error message that my username and password are incorrect, though I know that is not the case as I have reset the passwords in the db and made an entire new admin user.
I've tried everything outlined here: http://magento.stackexchange.com/questions/26071/magento-1-9-can-t-login-to-admin-panel
But nothing has made any change, any ideas?
If you try many solutions, but they can't tackle your problem. You should try to use database solution. I think admin user maybe looked because your client forgot his password and try login into Admin many times.
There is a solution here for updating old pass : http://www.boolfly.com/forgot-admin-password-in-magento/
Hope my suggestion is useful for you in this situation.
if you get error message about wrong password - then it is.
you need to check if your reset worked properly.