Originally Posted by mr_bill

On the drive side, there is a pin that keeps the chain from jamming between the largest chainwheel and the crank. It transmits no torque.

On the non-drive side there is a safety-plate. Some people call it a pin. It serves two purposes. It is a gauge to aid in proper assembly of the two piece crank, and, if the crank arm bolts are not torqued correctly, to serve as a fail-safe for a few turns of the crank. It transmits no torque under normal operations.

So, double check:

Crank arm lengths. (Unlikely.)
Centerline of frame to cranks. (Unlikely.)
YOU.

We are asymmetric creatures, think lobster claws.

(For most people the duh moment is put your right hand over your right shoulder at the top of your spine behind your back. Then put your left hand behind your back above the bottom of your spine and reach up and grab your right hand. Then visa-versa.)

-mr. bill