I noticed the folder shortcut problem and have deleted all of these which has helped.

I did wonder if it was files with the same name but it seems to be very inconsistent if that is the problem. For instance I have two sub folders from the same directory tree one containing files 1-24.cr2 and one containing files 1-48.cr2, yet when it loads it always complains about 19.cr2 but none of the others.

Oh well, one for the first service pack. And if anyone solves the problem in the mean time let me know.

Cheers