I now have the machine back from Juansolo who has managed to fix the issues. Only one thing remains and that's the clipping of the left edge of the image on my Panasonic TV. So if @SainT would be kind enough to implement positioning on the next firmware update that would be immense. This is a condition of the TV as it happens to a certain extent also from my 32X, and so not a condition of the GD7800.