I have been trying for a couple of days to connect my brand new Quantum 2 to my Mac. I have made sure that my Thunderbolt cable is not a display cable. I have installed and re-installed Universal Control. When installing, I went to Security & Privacy settings and allowed the exception (mentioned in other solutions). I have restarted my Mac several times throughout this process. I have unplugged the Quantum 2 and Thunderbolt cables in what seems like every possible order. Important note: when I first plugin the Thunderbolt cable, the power button light will flash blue 3 times but then stay red indefinitely. Please help.