Thread drift?
I just flew London/New York on BA. I had paid for a seat reservation. I cheked in online and printed my boarding pass. When I dropped my bag I was given a new boarding pass with a new seat number. OK, it happens. What irked me was that I had paid for a window seat and my new seat was an inside aisle. The check in agent changed it but it can't be impossible to look at the previous allocation and try and pick the same kind of seat even with an automated system. Oh well, like I said, things happen!