It seems that the only time I post something is when I am having a problem......here we go again. I bought two pairs of the Cactus V radio slaves and have used them twice. The first time they worked just fine and were perfect for my application. Last Friday, I used them again but they just did not work well. If I pushed the test button on top of the transmitter, the flash went off every time! When I pushed the camera's shutter button, I got an intermittent flash. I tried two different transmitters and two different cameras. I tried various camera settings to no avail. I finally pulled out a backup Cybersync trigger and everything worked as it should. It seems the the Cactus V has a mechanical contact problem. Yes, I tried reseating the transmitter several times. Any ideas?