Page stuck

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?

Many thanks for your suggestion.

It wasn't already Freeze-d, so I chose Freeze then Unfreeze, but it's still stuck.

I've attached it (I hope)

Thanks for that suggestion.

I must have spent an hour trying various options there last night.

I'm still stuck.

If anyone can replicate the problem and make further suggestions, I'd be very grateful.

I've downloaded it from the forum to another computer - and it's fine on that one.

Mystery, huh?

Thanks for your interest.