Hi Shane, I'll have to get back to you tomorrow - it's past midnight here now. But in the meantime, try this. Deinstall the STM32 USB serial device in device manager. Turning everything off. Turn the rig on first and then the PC - this should force a re-install of the drivers. Wait 15 minutes Now check the device manager. If there are no errors at all indicated - that start WSJTx and see if it is also happy or whether it still displays the same error message as before. 73 Ed.