I was programming my TinyShield and it was working pretty well. Sometimes the output to the serial monitor was garbled, not sure why. I clicked the upload button to upload a new sketch, and that action made my iMac reboot. After that, in the Arduino IDE, there was no USB port for the TinyShield. I think my USB shield just died :(
Please contact us at info@tiny-circuits.com and we can discus getting a replacement for this.
Thanks,
Ken
TinyCircuits