Thanks, I searched for NO_MAP and "NO_MAP" so and there are none with quotes so it's not that problem.

bagginsbill's decription sounds like what I am experiencing.
Everything was working fine, I have been adding props and characters etc. to my scene over the last several days - then all of a sudden, when I open my scene now,  poser asks to find NO_MAP

Thanks again for all the suggestions, I will keep on investigating how to fix this :-(

Robin.