Sorry - should have said that I had tried that already. Even with all the settings to the max they don't appear to show - I've changed the colours too in an effort to get them to appear... Thanks for trying at least!
Essentially, on an XP PRO machine (office) if I set up fences the only way to actually see the fences is to have a solid colour desktop. At home (also an XP PRO machine) the frames are visible and accessible 'above' the wallpaper. The config of the work machine is XP PRO, DELL, Dual screen (2x19"), no other wallpaper management - the home machine is much the same with the exception that the screens are larger. Any one with suggestions on how I can fix this would be a per