In processing the photos from last night, I could see the issue fairly repeatedly. At this point, I am planning on sending the lens into Canon for repair unless someone has another idea of how to fix it.

Full image:

Boston-1402 by kayaker72, on Flickr

Left side of the frame:

small (1 of 1) by kayaker72, on Flickr

Right side of the frame:

small (1 of 1)-2 by kayaker72, on Flickr

Thanks everyone for your help....
Brant