I am experiencing a problem when I use the MS Office Spreadsheet control (9.0) in my AutoCAD VBA apps. Our computers have MS Office installed. The references seem to be in tact but an error is displayed when code runs. The error says that a variable has not been defined. In fact, the variable is defined as public in a code module. If that error is cleared another error reports that a function is unknown but the function has a public scope and is in a code module. I check the References but there are none missing or broken. Our computer systems (20 of them) are nearly identical but this problem does not occur on all systems. What might be causing these errors?