BobbyG

I'm no expert, but I can't imagine how your pedalling or shifting could cause this. It is mechanical, whether it's the chain, the gear or the derailier. It is possible the problem didn't present itself at the factory because they didn't evaluate the bike off the stand under actual riding conditions with the forces that entails. Or it could be something was knocked out of alignment or damaged in shipping. Whatever the reason I would contact Bike Friday and explain the issue. They should have an afilliated bike shop or repair center in your area (the San Francisco bay area) and they should foot the bill to have the bike evaluated and adjusted and repaired if it is something caused by the overhaul.