Upgrade to the latest version of Mendeley. To fix this problem, follow the steps below. Why am I seeing an 'Incorrect username or Password' message in Mendeley Desktop?Īs of our new authentication process, if you have re-authenticated your account (you'll have been asked to accept some new terms and conditions and verify with your password) or changed any of your credentials with Elsevier, you may have problems running Mendeley Desktop if you are on an older version.