The MRCC USB Host Ports are USB 2.0 specification compliant. These ports have over-current sensing protection circuits, which when tripped will remove power from the USB device that is connected to MRCC. When this happens the LED indicator next to that USB port turns an amber color (instead of green). This protects MRCC from being damaged by faulty USB devices.
Over-current protect can happen with USB devices that require an external power supply but do not have the power connected, or it is drawing more current on power-up than what the USB 2.0 specification allows.
If your device is triggering USB Host Port over-current protection:
First turn off MRCC with the power switch. This resets the power protection circuit.
Try using the external power source with your device, and turn it on before switching on MRCC.
Switch on MRCC. A good USB connection will be indicated by a Green LED indicator next to the MRCC USB Host Port.