The sketch, any sketch, will load and run when attached to the USB and IDE with the sketch and radio connected.The sketch will NOT load when attached to the USB with the shield and radio connected. (not talking to the IDE)
I have been trying to get the arduino xbee shield up and running with two XBee's and there appears to be a problem loading the sketch when externally powering the boards. I have verified this by uploading the "Blink" sketch. When the Xbee shield is plugged in (doesn't matter whether the jumpers are in the USB or XBEE position), Blink won't load, evidenced by the LED fast blinking 3 times.
I have the same problem on Arduino UNO while on an arduino mega everything works correctly.Does it exist a solution to that problem?