An activist investor has correctly identified a dysfunctional area of the business.This is a bit of a trying time for Pfizer (PFE -1.18%). While the last 12 months saw the stock market provide a stunning total return of 41%, the struggling pharmaceutical giant returned a piddling 1%.Raining on the parade even more, Pfizer just reported some good news that seems to confirm the presence of some internal issues. So let's examine this new green flag that's also a red flag for anyone looking to buy the stock.It ...