I just saw your posting of early on the 4th. To answer your question, no the blue LED does not flash. The Green LED ( active) stays on.
No, I am not using any voltage divider. Arduino powered from USP connection. Pin 7(solenoid valve) powers an optocoupler-5v relay combination. Pin 10 powers an optocoupler for the camera shutter. Flash pin is not used. Pin 2 used for blue(waiting) LED, and pin 3 for green(active) LED.