Yongnuo/600ExII/R5C combination

Jan 22, 2012
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Friends.
I am trying to use this combination. I have managed to get sync between the trigger and the flash. (Green lights are on). But, when I click on the camera, the flash does not fire. (When I press the flash button on the flash, it fires.) What am I doing wrong? Or is this problem related to the new flash mount? Thank you in advance!