openFrameworks can't find Arduino serial device

Trying to get openframework's serialExample to find my arduino.
Console returns these errors:

ofSerial: listing devices (0 total)
OF: OF_LOG_ERROR: ofSerial: could not find device 0 - only 0 devices found

the example code enumerates the devices, so it should find my Arduino at COM3

/------------------------------------
   // needed for serial bus enumeration:
   //4d36e978-e325-11ce-bfc1-08002be10318}
   DEFINE_GUID (GUID_SERENUM_BUS_ENUMERATOR, 0x4D36E978, 0xE325,
   0x11CE, 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18);
//------------------------------------

void ofSerial::enumerateWin32Ports(){

    // thanks joerg for fixes...

	if (bPortsEnumerated == true) return;

Does anyone have a solution for this?