Hi Jeffos, Doh! Don't I feel embarassed! It was, as you suggested, erroneously hidden columns. If I had a cat then I would blame it walking on the keyboard. As I have no cat, I can only blame myself. To be clear. the remedy was for me to right-click where the headers would be in the Region/Marker Manager list view and choose the columns to add back. Thanks again. Sorry for the inconvenience. Carry on. Nothing to see here.