No, not really, I try to play vanilla releases as much as possible as SVN changes seem to often disrupt or alter the game play. Not complaining about that, as that's what development versions are for, but I'd like to stay off of them if possible (which might not be the case here).
But if it's a bug in opportunity fire I may find a way around it. Can you be more specific where it happens (civ/unit type/maybe even city)?
I also remember that I was the target of opportunity fire in this game before, and there has been quite a lot of fighting going on recently over at the former Persian continent, so I'm a bit curious why it hasn't happened earlier. Might be a recently developed type of unit that's triggering it?