Noel,

Many thanks for your detailed reply and to Jerry also. Being borderline dyslexic I managed to read your response in two different ways!

So it is clear in my mind, does unticking 'Allow Style Change' prevent the left-pane style from having any effect, or is it the 'Choose(2)' style that it stops? Should it be the former, then that is not what seems to be happening with my setup. However, before I try 'Return to Factory Settings', thought it best to be absolutely certain about what should be happening so I don't confuse myself further!

Allan