I'm hoping this is totally not puzzling to you guys, and you can tell
me what to do.

I've developed a complicated excel/VB application in excel 2000
(because that's the version that's on this machine.) Next, I handed
it off to a beta user who was using version 2003, and it worked fine.
He passed it on to a co-worker (also using excel 2003) to try, and it
failed. We then learned it worked on some pcs and not on others. All
machines are running Windows XP and Excel 2003. It works fine on some
and not at all on others.

When it doesn't work, you get the error box "File error: data may have
been lost" as soon as you open the workbook. That message must be
clicked 20 times (really, exactly 20 times) before the workbook will
open. When it does open, all pictures and control buttons (from the
control toolbar) are missing.

I was thinking it was an ActiveX version problem, but I don't know
enough about this kind of thing to know where to look or how to fix
it. Of course, it might be nothing like that.

Can anyone help?