Excel Table Column & Row Highlight Issues

Excel tables have the function where you can highlight an entire row or column by hovering at the top of the header cell and a small black down arrow appears - you click and the column is highlighted (not including the header cell)

These little arrows are no longer appearing on either the rows or columns?
The table is still there, and I can highlight the entire row other ways (like using CRTL + Spacebar) so something is still working?

Any ideas how to get these little arrows back as I highlight rows and columns this way regularly!

Many thanks in advance.

Warwick

Is your sheet protected? I cannot duplicate this. The sheet must be active (clicked on) before this will work though. What happens when you click on a column header?