I don't know mate, I has the latest one on it. It's a Pioneer 71 too.
Do you meanthe Pioneer LX 71? That's the player I have. I would try the disc in another player. Of course it works as it plays in the other guys Marants player.
I f the LX71 is on the latest firmware then you might have to send the disc to Pioneer so that can take an image of it and send out an firmware upgrade for that player. If one disc doesn't work, sending it back for another one won't make any difference. Don't change the player as it's a very good BD player. The Nick Cage film Trespass won't work on the LX71 but is fine on any other player. I called Pioneer and they told me to send it to them. I haven't got round to doing it yet but you should try it.