I'm having the same issue. I think it's related to the Microsoft patches last night. Have every user in my firm unable to use their buttons in Excel. An easy test is to start a new workbook, then click Insert on the Developer tab, choose the button control under ActiveX controls, and try and draw it on the sheet. Get the error "Cannot insert object" immediately. This is really really bad. Our whole firm is unable to use their programmatic worksheets.

Thanks Microsoft!

Anyone have a fix?