Samsung devices tend to go one level down into the media library tree, as you see it in KooRaRoo's GUI, so you may not see the folders you add on your Samsung TV or BluRay player.

To fix this, there are two options:

1) Go to Devices pane, double-click on your Samsung device and tick the "Disable manufacturer extensions" box. After that click OK to apply and try browsing again. This time you should see your media library tree exactly as it is in KRR on your device.
2) Alternatively, you can relocate your media folder to be under "My Videos", "My Music" or "My Photos" folders. To do that, just drag-and-drop them within KRR GUI's to the right location and they'll appear on your device.