Sorry, Michael. Using Qselect on the 'fixed' dwt yields this:
AutoCAD menu utilities loaded.
893 item(s) selected.
The only option for Entities in the Qselect dialog is Parcels. This is 1 less than the original dwt. Entering Erase, All, reselects the same # of objects...repeat, repeat, repeat. Never ends......
Note that the viewcube is also at the weird twist, even though the drawing is in WCS with no twist. I've seen both this the Parcel problem before, but after a week at AU my brain is fried and I can't recall what was done to fix them. I'll try to think of it on the trip home tomorrow, but hopefully someone can figure it out before I get home.