I can get Crop Marks and Guide Lines to work and show up on the main, edit and soft proof pages. None of the other marks e.g. solid black, dashed black and white etc seem to work. They don't show up before or after printing. Any ideas anyone?

Crop marks and guide lines extend beyond the edges of the prints so you can see those on the live view.  All the rest are single pixel edges at the edges of the prints so those are not "previewable".  But they do print!  I just retested to make sure nothing happened recently to make them not print and I can confirm that while they don't show on the live view, they do print on the actual prints.

Regards,
Mike