The issue is quite simple and it's due to us not having released version 2 of the software yet
When we manufactured the boards we also made the bootloader much better and fixed a few bugs.
We also decided to up the speed of the bootloader to 19200 bauds to speed up the download of the code.
This is supported by Arduino v2 which will be out over the weekend. this adds a lot of improvements
Sorry for not explaining this clearly on the website, I really thought the new version would be out
before people got the new boards.