Data Validation Combobox Help

Tony

Thanks for your time earlier.

The Combobox works as it should now so I can not thank you enough, however, I have found a strange bug when used on a Surface Pro 4 (which is required as the spreadsheet is designed to be used by site engineers). I am unable to write into any cells once a selection has been made in any Combobox, even though it all works fine beforehand.

Any ideas what this might be?

Thanks again, Ben