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I've got a Teensy3 with the same problem. The reset button trick didn't work for me.. Running latest Arduino, TeensyDuino. Win 7/32.

Andy, are you saying you can reprogram a board once, then its hosed? And you've done this to both boards? Or are you saying one of your 2 boards does not work? - 0xbadcafe

I have the same problem. I'm using latest Arduino (1.0.4) and TeensyDuino, and yes the latest loader on my Win 7 32 bit system. My Teensy2.0 projects work fine - love that board ! - but I cannot get the USB serial stuff to work with the Teensy3. I plug it in, the orange LED flashes, Windows...