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OK, here is the scenario. I have 2 600ex-rt flash units. I place one in master mode and attach it to my 5dII, I press the mode button until Gr shows at the top. This allows for individual control of up to 5 groups. My second flash is remote in slave mode running on the same channel, etc, etc.
When I press the test button on the master unit, the slave fires as it should and the flash on the camera does not change mode BUT if I take a picture in the group mode, the flash reverts back to ETTL. I really want the flash to stay in the Gr mode..
What am I missing??