I have a Fleenor Opto-splitter and an ETC Element. We just rented an ETC Sensor 24 rack portable dimmer for a show, and I'm trying to split my signal from the board to both the dimmer and my LED fixtures. The LEDs take the signal just fine, but the DMX light on the Sensor just blinks. If I plug the cable directly into the board the dimmer works. I tried switching the ports, and I tested all my cables. Any ideas?