Hi Joe,
the problem is, that you can only switch between scenes, and not from a part of scene to the next part. You have created scene1, which contains 6 parts; instead of that you should create 6 scenes, each with only one part (item). Then you can move forwards and backwards.
Within a scene you can move from part to part (only forwards) with Go!
Module is set to Scene list, Device to "Ausgewählte" = choosen or selected or similar, I don't know what is used in the english version; Channel is set to Go!, Flags = no flag or try T. Open your scene list window, select the first part of your scene; then go back to the grafical stage view window. Now you should be able to move from part to part, but there is no way back by key. You have to select again the beginning with your mouse.
I guess the way with 6 single part scenes will be better for you !
I hope this will bring you on the way.
Regards Okulus