I have an OmniPro II from 2002 and an expansion board and a wireless receiver feeding into the main board. I just tried upgrading the ROM from 2.3C to 4.0B and had problems with the wireless transmitters not working so I went back to the original ROM and the problem is still there. When I use PC Access to turn on or off all the lights they all work but trying an individual light on will not work The status screen will show a light turning on but it does not actually happen . I also notice that the status LED on the physical expansion board is flashing the four times per second and I have confirmed that the wires connecting the two are tight. Also my control panel does work and it is connected to the same two terminals on the main board. The wireless receiver is also connected to the same two terminals. Do you have any ideas of the problem or additional steps that I can try?