How to fix a screwed up file that doesn't want to open?

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Having an issue with a drawing file that won't open. We're using Carlson 2014 and Civil 3D 2014.
We've got a drawing of property exhibits that apparently has something wrong with it or is pulling some sort of error from our server- we don't know exactly what the issue is.
If you try to open the drawing from the server, it loads to about 6% on the status bar on the bottom, then locks up and won't go any further (still with a black screen).
If you copy it to your desktop, it will actually load to where you can see the objects in the drawing, but right after that locks up and won't go any further.
We have a backup file that you can copy, change to a dwg, and open and it works fine, but as soon as you save it, it does the same things noted above. I did this last week, ran an audit and purge on the file before saving, yet it still has the same issue.
I tried running a recover on the drawing, it goes clear through the recovery process, says there are no errors, brings up the drawing and then locks up.
We're at a loss here- is there any way to diagnose what the issue is with this particular file and fix it?