It has changed. I used "their" (which seems the most natural to me) and it was accepted. Apparently using they as a gender-neutral pronoun is not generally accepted, yet in my dialect it is used all the time for everyone. I thought this was universal -- apparently not.
Like kingthatcher I assumed 'their' for gender-neutral was fairly universal. Otherwise, when gender is not known, what does one use? What would you say epac-mcl? My dialect is from England. London to be more precise