I've hesitated to post this, because I know I'm going to feel very foolish when I see the answer.

Yesterday, I opened a much used document and found that I simply couldn't scroll it horizontally to view the whole of Column A and half of Column B.

http://www.peaksoft.co.uk/oddimages/excel_image.jpg

I've resized the screen and the document every-which-way and I'm stumped.

Could someone please help me out?