Your version shouldn't hinder your ability to move forward in this case.
In Lochport Cemetery, the way forward is located in the south part of the map. If you come across some gravestones that are spawning zombies, you'll be on the right track.
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Thanks so much for your reply. I've been to Lochport repeatedly and have found no exits to other areas. I'll go once more but I've been there numerous time, looking. I went into the underground area (I forget the name and got--I think it was a key, for another quest, which I don't have. Ah, what I DIDN'T do was to look back before I left that area. Zombies had spawned....another area! I then found the waypoint.