I do remember hearing it on some rides, and I remember specifically a few shows that mentioned no flash photography, but not specifically on POTC. And everyone is right - there were plenty of people taking pictures on Pirates, so maybe I just saw the others doing it and assumed it was okay on that ride.
I'm typically very much a "follow the rules" kind of person, so I wouldn't purposely do something against the rules if I had known about it. And as I said before, I don't really remember taking many pictures while on any rides (I know I did on the Jungle Cruise and the Safari at AK), much less on Pirates, but I saw this thread and felt bad in case I had since I didn't have any idea until seeing this thread that it wasn't allowed.
Lori