If I had to guess, it would be that you didn't add your user to the suggested groups. If you use the adduser script, there is a point when it will suggest pressing the up button to add that user to the recommended groups.
If you weren't added to those, you can do it with the following command, replacing $USER with your username. Make sure you run it as root.
Code:
usermod -a -G lp floppy audio video cdrom plugdev power netdev scanner $USER