Thanks samuria, As I read your post, the penny dropped. Of course the answer is that when I set the icons I was using IE, which they are looking for, but then default to the current default browser (Firefox) hence the error message, followed by the correct opening. Deleting the old icons and setting new one's cured the problem. Should have realised it m'self, but many thanks for pointing me in the right direction.
Experience; is something you gain, just after you needed it most.
When faced with two choices, simply toss a coin. It works not because it settles the question for you. But because in that brief moment while the coin is in the air. You suddenly know what you are hoping for.
