it was actually related to the fact described above; when i ran my code in Windowed mode, Max adopts the Windows desktop windows depth; when i ran in fullscreen mode, I did not ask for 32-bit, so got either 16 or 24-bit ... lesson learned? make sure if you need to run fullscreen and windowed mode that you explicit ask for 32-bit in the Graphics() command :-)
FullScreen vs. windowed
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