I just downloaded the Eagle board/schematic files provided for the Pro from the site (
http://digistump.com/getpro#product_resources) with the intention of changing the USB connector. When first opened, the board file is the mess as shown below:

Once cleaned up, it becomes evident that there are a lot of incomplete/missing traces on the board, as shown by the purple lines below:

Is this intentional, or was an earlier/incomplete copy of the board uploaded by mistake?