Neat problem Cédric. I too have had some problems with command buttons, though not this problem specifically. I would recommend making a new document, formatting it appropriately with command buttons and such so that it looks like the original, and then pasting the code from the old document into the new one. I realize that if the file in question is large, this may not be the best option for you. At the very least, this procedure would help narrow down where the problem lies.