Canon ST-E2 issues

I am shooting with a Canon 5DMkII, an ST-E2, a Radio Popper PX transmitter attached to the ST-E2, and PX receivers. I've had numerous incidents where the 580 flashes do not fire. One problem was the ST-E2 not sending a signal. A Canon rep told me to turn the knob on the top of the camera to the Green setting, and the unit started working again. Since then, I have had to do this trick a couple of other times.

The other issue, though, is that at times the orange light on the PX receiver goes off when I trip the shutter, which means the PX is getting the signal. Yet the flash does not fire. As soon as I took the ST-E2 off the hot shoe, replaced it with another 580, attached the PX transmitter to it, the remote flashes fired.

Anyone else have issues with the ST-E2? I'm trying to figure out if mine is a bad unit, or there is a design issue with the unit in general.

allenbirnbach wrote in post #10455896
I am shooting with a Canon 5DMkII, an ST-E2, a Radio Popper PX transmitter attached to the ST-E2, and PX receivers. I've had numerous incidents where the 580 flashes do not fire. One problem was the ST-E2 not sending a signal. A Canon rep told me to turn the knob on the top of the camera to the Green setting, and the unit started working again. Since then, I have had to do this trick a couple of other times.

The other issue, though, is that at times the orange light on the PX receiver goes off when I trip the shutter, which means the PX is getting the signal. Yet the flash does not fire. As soon as I took the ST-E2 off the hot shoe, replaced it with another 580, attached the PX transmitter to it, the remote flashes fired.

Anyone else have issues with the ST-E2? I'm trying to figure out if mine is a bad unit, or there is a design issue with the unit in general.

I have a similar setup with no issues that you are describing. Mixed 430EX and 580EX combos with 580EXII's and STE-2 with PX Transmitter. The only thing I can think of is rent/borrow another STE-2 and try it. That should tell you if it's the STE-2.

Did you change any of the settings on the PX Transmitter? If so go back to "default" as shipped. Funny suggestion about putting 5DII on green box...not sure how that would change things.