
At first I thought the trace was cracked or the pad had separated from the trace, but I didn't find a problem when I scraped away the coating on the trace. It turned out to be a cold solder joint (note the dull appearance of the solder).
All I had to do was re-heat the solder. It works fine now.
The damage occured when I packed the ThinkStick in my suitcase with the extension cable attached on a recent trip.