I sometimes work in manual calculation b/c of the size of my files. A few
weeks ago, I started get a Microsoft Visual Basic dialog box that pops up
every time I hit the F9 button (to force the cells to calculate) that says
"Can't execute code in design mode". The sheet will still complete its
calculations after I hit OK.

As far as I can remember, nothing has changed in Excel for me. Can anyone
shed any light on this issue?

Thanks,
Danni