Sorry for adding an additional post after my artlantis export problems but the issues have still not been resolved and now when viewing the model in 3D there are long phantom objects that do not show up in elevation or wire frame and also seem to be the problem with exporting. These are making the program un-usable as commands either do not work or take an age, even to scroll down the screen for example. I have tried re-opening in a different file and re-installing but it is still not working.
Any help would be very much appreciated.