This is a hard problem to describe! I have a spreadsheet with a few worksheets that all have various data validation dropdown lists. Just one of the worksheets (Street Lights) doesn't display the little dropdown arrow unless you click just to the right of the cell. This happens for ALL the columns in that one worksheet that have data validation applied, eg Road Lookup. If I copy this worksheet to a new spreadsheet, the dropdown arrow IS displayed. I was just going to send the one worksheet but the problem only occurs when it's included in ALL the worksheets. Here's hoping one of you EXPERTS can solve this one. I've spent hours on it!