Probably there is a very simple solution to my problem - I just can't find one! I have a point shapefile with x, y and z data - I can display it in arcscene but it is flat - the z data isn't being used! How can I direct arcscene to the z field in my attribute field so that it displays points at different levels?!
I would guess that your layer is not a 3D layer. You can check your layer attribute table. If the Shape field just says "Point" for each record you just have a 2D layer. You can use the 3D Analyst>Convert>Features to 3D tool to make your layer 3D. Once you have done that, open the table and look at the Shape field. It should now say "Point ZM", and the "Layer features have Z values" option should be active now.