If you experience unexpected behavior from Kerberos Manager (for example, you are prompted for a password even though you already have a ticket-granting ticket), you may have multiple installations of Kerberos Manager.
Verify that you have only one copy of Kerberos Manager on your PC.
You can do this by searching for multiple copies of the Rskrb5.dll file. If you find multiple copies of this file, uninstall all but one copy of Kerberos Manager.