The Copy and Paste in Place tool has been changed for X12.  The Copy and Paste in Place tool that appeared on your main Edit toolbar in X11 has been removed and replaced by the Paste Hold Position tool that will now appear on the copy sub-mode toolbar.  Simply hit the Copy/Paste tool and then hit the Paste Hold Position tool to get the same behavior in X12.  The new method changes this to a two step process but makes it harder for people to accidentally make duplicate objects right on top of eac