ST-E2 issues

[misterb]

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.

[lefturn99]

I don't think the ST-E2 was designed with Radio Poppers in mind.

Does the ST-E2 work without (gasp!) RPs?