TO ERASE FROM HERE:
FAULTY SCHOTTY DIODE - NO CODE BUG RELATED.
If ASM is powered on battery side (2s or 3S), 3DR radio (new model) with 4 cables, 3DR power is ok. Connection seems to be ok. Screen display connection BUT no incoming packet (parameter for example).
The same board with USB side powered on hub (and no battery plug on the other side) , everything is ok. Parameter are fast downloaded and ASM work very well.
TO ERASE FROM HERE: FAULTY SCHOTTY DIODE - NO CODE BUG RELATED.
Not sure the code but perhaps it is. Here more info: http://diydrones.com/profiles/blogs/ardustation-mega-v1-0b-arrived?xg_source=activity&id=705844%3ABlogPost%3A1036518&page=24#comments
(it's last version from GIT repository compile with Arduino 1.0.5)