Hi,
I don't know if it is common knowledge but i haven't found any mention describing this problem (bug).
The problem is that light sources don't illuminate a child object on a '2nd order' - Main model -> Cab model (1st module) -> Radio (2nd module), even if the child assigned to the light room, which should be illuminate by the light source.
I guess one way to solve this problem is do not use module in module, but it is kinda weird that objects are not illuminated.
I hope that i describe this problem (bug) well.
Best regards
Mikes