AutoCAD Architecture :: White Ghost Boxes With Copy / Move Or Mirror Command

I am getting these white "ghost" boxes with every copy, move or mirror command. They can be individually deleted but that takes too long. The more there are the slower each command takes, to the point a copy can take over a minute. If I save and close then when I reopen they are gone -- until I execute a command. This is unique to a single file I recieved  from a friend using a PC based Autocad; I use Autocad for Mac. I had no trouble with his file until I did a "Save As" and used it as a base for a new file. Now, every file that is a copy of it, even any file in which I x-ref it, has the same problem. All of my original, older files are fine. There is simply too much work in these (now) five files to start over. See attached.