when using the "Mood Matrix" kinds of themes, the home menu renders a some kind of 3d model with the simple background and the top screen image as textures, i wasn't able to find a way of doing that in c# (and i'm lazy), so those themes can't be rendered in the simulator, another draw type not suported is solid color, for now don't use the simulator for this kind of themes
now i'll check the MH theme to see why
EDIT: Ops just checked, the top screen image get replaced by the simulator because i swapped the data, also, looks like the MH theme uses a different size for the simple image, i don't think i can fix this, i'll try