Hi
See also my earlier post about BT Connection issues. Now as you said I removed my own Bluetooth 4.0 Module from the PC and bought an makeblock Bluetooth dongle as those are supposed to be compatible. Unfortunately still no luck. Now the Bluetooth Module and the dongle are not pairing. When pressing the small Button on the dongle both LEDs keep on flashing. So pairing fails. I also upgraded the mbot Firmware.
BR
kehlh