OK, something weird happening here...
First, use open or double click to open the file below:
WallF.3dm (474.2 KB)
The lower left corner should be at World 0 (three objects)
Now, open a new blank mm file, Ctrl+C copy all three objects out of the old file and Ctrl+V paste into the new file. They come in at the right place.
Now, drag and drop the original file into the new file (leave the pasted objects in there) and choose "Import".
Here, the objects come in displaced... the lower left corner is at -320.00,-1378.00,0.00
Anyone else see that? I can't figure out why this is happening... Must be missing something obvious...