OK Done some other stuff in the meantime... Exported the object and imported it into UVMapper which reports the correct number of verts & faces but doesn't produce a map. ?? Exported the object in different formats and imported into a clean (i.e. new scene). Same thing happens. Only thing I noticed with this is that when zooming in, at one stage you see a vertical line, but only once. It's as if everything has been squashed flat. Yes it's listed in the outliner. Automatic backup copies are done every 30 mins. They are no better as I don't know when the problem occurred. Normally, I do an Undo if things don't work out as expected. Reddog I am sending you the blend file. Thanks for the assist.