"Our missalettes still contain the invitation, but add a caution that the visitor should check with his own bishop or metropolitan before receiving and should "be in accord with the rubrics" of his own faith."
That's what it used to say here. Why, since the Roman Church is very, very aware of the fact that Orthodoxy does not allow inter-communion except in the most extreme circumstamces, would a Latin diocese publish such a thing? Its seems to me terribly disrespectful of a sister church. We have never done such a thing (except as we all know in the Middle East, but, as Kosta says, that's another story).
We have a large Orthodox presence in Atlanta, both Greek and several different groups of Russians, so it's not a problem here, but if somebody lived in a very isolated area where no Orthodox priest was available, and some emergency came up, perhaps they would have been given permission ahead of time?
The invitation is so hedged about with cautions, it makes it pretty clear.