On an earlier version of quest (v5.2) I had a nice code working that displayed a list of visible objects in they current room.

I've loaded up the same project and it is now throwing up an error running script: error evaluating script

FormatObjectList("You can see", player.parent, "and", ".", true)

Any suggestions?

I have a feeling the final parameter is no long used. Try:

FormatObjectList("You can see", player.parent, "and", ".")

I owe you a drink:)