I have a 200 sheet .xlsm worbook with a lot of code. When I add a new ActiveX command button to a sheet, then click on "Properties" for the button, Excel crashes every time. If I open a completely new workbook, the same thing happens but only once. If I then access the Properties for the for the button in the new workbook, the Properties dialog opens. I can then also open the Properties dialog in the original workbook. Strange?