Hit the TSA line and the agent was convinced and informed me that she was convinced that it was a fake boarding pass. After a few minutes, she shruged and said "whatever" and waved me on to the machine.
From time to time, the airlines will make changes to their boarding passes, but that information is never communicated to the TSA (or, at least, to those of us on the front lines) ahead of time, so we know what to expect. Instead, we have to make a judgment call ... or ask a supervisor or co-worker, which really helps to inspire confidence in our agency. (Not!)