Problem using sudo in exegnulinux_3.3_preview4

Hello, For me also, exegnulinux_3.3_preview4.iso works in live mode and installs fine. During installation I told it to not disable sudo. It asked for a user password and a root password. But now, when I try to run an admin app, such as adjust date & time, a KDE su dialog appears but doesn't accept my password. Also, when I enter a terminal sudo command, it fails saying that I am not in the sudoers file. Is there a way to correct this? Should I reinstall with the option to disable sudo? thx - Robert