Problem with latest Arduino USB driver

I've been running and communicating with my Arduinos for over a year. I'd open the port and configure it with no issues.

Now, with the latest driver on a couple machines, the configuration fails with a 87:ERROR_INVALID_PARAMETER:

HANDLE WIN_CALL OpenPA(char* SerialPort, char* Config, int TIMO)
{
	HANDLE hComm; DCB dcb; COMMTIMEOUTS CommTimeouts;	//	comm structures
	// MessageBox(0, Config, "Danny Rules!", 0); return 0;
	hComm = CreateFile(SerialPort, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
	if (hComm == INVALID_HANDLE_VALUE) HANDLEERROR(SerialPort);	//	check open
	if (strlen(Config)>2) {
		if (!BuildCommDCBA(Config, &dcb)) return 0;			//	set configuration
		if (!SetCommState(hComm, &dcb)) HANDLEERROR(Config);}		//	configure
	if (!PurgeComm(hComm, 0XF)) HANDLEERROR("");			//	clear operations and buffer
	
	CommTimeouts.ReadIntervalTimeout = 10; CommTimeouts.ReadTotalTimeoutMultiplier = 10; CommTimeouts.ReadTotalTimeoutConstant = TIMO;
	CommTimeouts.WriteTotalTimeoutMultiplier = 10; CommTimeouts.WriteTotalTimeoutConstant = 100;
	if (!SetCommTimeouts(hComm, &CommTimeouts)) HANDLEERROR("");		//	set timeout
	return hComm;
}

BTW: I can no longer communicate with the Arduino using TeraTerm/Putty neither. Of course, communicating using Arduino serial monitor and Keysight VI works fine.

BBTW: Not that it makes a difference, but the config string is: [color=purple]baud=115200 parity=N data=8 stop=1[/color]