The entrance to the cyclops cave and the bridge on the road to empath abbey seem to be absent in my game. Is there anyway to make them appear or reason they might not be there? Am I just missing something obvious?

That must be the strangest error description ergrding U6 I have read so far... and one of which I'd have asid: this cannot be...

Are you playing with Nuvie or ScummVM by any chance?

I'm just played through DosBox. I haven't been able to find anyone else with this same problem, but no matter what I try the cave isn't there and the road to Empath Abbey from Skara Brae just leads to an unpassable river.

Just to prove I'm not crazy here's a picture of where there's supposed to be a cave.

Very strange indeed. Do you have a screenshot of Empath Abbey without the bridge?