I have built a CNC Plasma table and have everything working fine with the THC turned off. If I turn on the THC I can see Arc ok and Torch up/down signals going to Mach3 but the torch height just doesn't change. Ive followed the guides Polabs provide I`ve even installed a new PC and new software. I`m running a fully licenced version of Mach3. I have created a support ticket with Polabs but they have yet to respond. If I had hair I would of pulled it out by now.