Pockets wizards not communicating?

Hi. I'm having issues with my pocket wizards. I'm using a nikon d700 camera and I have 2 FlexTT5's and 2 SB-900's. I'm trying to use one flash on camera and one off at the same time. I have done this in the past and had no problems. Today, I'm using the same settings that I usually use on my camera and flashes and the flash off camera will not fire. It seems as though the pocket wizards are not communicating or something. Any tips/suggestions? I'm getting so frustrated! Lol.

Radio TTL is still sketchy at best. I have used the pocket wizards and always find myself going back to the CLS commander built into my D300s. Your D700 has the same thing. Stick to that.

Here is one where I used a D3X with two SB-600s as key and hair lights with an SB-800 as the commander. It was much easier to control than the Flexes.