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Hmm, my best guess is that my theme was playing with the classes somehow?
But your suggestion to change the Address to .icon img did work! The only thing is that Append and Prepend settings don't work when I do it this way... but that is just a small thing.
Thank you for your help
Append/prepend would not work because an image is an embed which cannot have anything nested within. If you want to use append/prepend then you would need to target something that can have something within it such as a cell or div. This is labelled "advanced" because it requires workable knowledge of HTML and CSS to use and for those without such knowledge the default values are supplied to make configuration a no-brainer.