OK, I've copied that file over, thanks a lot.
An hour ago I noticed another issue.
I always check "Accept cookies only from sites I visit" and "Delete cookies at exit".
However, I was on one website this morning and when I exited it I checked the cookie folder and there were over one hundred of them from websites I have never even heard of. So I exited Opera completely, expecting the cookies to be gone. Unfortunately, when I restarted Opera, all the cookies were still there and I had to delete them all manually. Is there another setting that I have missed?
Thanks for all your help so far.
Ed