I tried taking some images this morning with OCF and my YN560s triggered just fine with my D90 and my Cowboy radio units. I tried to add a 3rd light (my SB-700) and it will NOT trigger with the Cowboy units. I have tried setting it on manual, i-TTL (I know it's not compatible), etc, but it will not trigger. Is anybody familiar with this combination and can help me with the set up? It seems very simple with radio units but I'm not having luck with these. I'm confused. Thanks.