I have received several spreadsheets from coworkers that, when opened
in Excel, do not appear. Excel boots up fine. I can "arrow" around
as if the spreadsheet was on the screen and cell contents show in the
contents line at the top of Excel but the spreadsheet is not showing.
How can I:

1. Get the spreadsheet to appear?
2. Set up Excel so that this does not happen again?

I've fixed this in the past by dumb luck - which I have an abundance
of - but it's frustrating and I don't have a clue what I did to fix
the problem.

Can any of you fine folks help?

Thanks,
Pat Quick