strange command button problem
 

I had a few command buttons that have macro assigned to them.
They are modified on Excel 2003.

I had tried opening the spreadsheet in Excel 2000 in computer A, however all
the command buttons are not clickable. The buttons do not have any properties
in design mode.

The exact same spreadsheet is working in computer B with Excel 2000.

I had tried repaired, updated computer A to SP3 same as computer B and the
problem still exists.

Anyone can help? thanks