Mmmm... This is what i do: (Sorry for my bad english)

1) Load the default cessna at tncm
2) Turn off the engine, master, avionics, battery and check that all is death.

3)Load the cs757, the 2d panel appears
4) Then, i open all the other panels (Overhead, radios, irs, etc etc) i open and close all the 2d panels.

Anyway, the cdu is always on. Also, i can turn on the navigation and strobe lights, but not the taxi or takeoff lights  :-?

Any help?