display glitch in "realistic" with perspective "on"

[arxtek]

using lenovo w520 with a 2 gig quadro 1000m win7 pro, a drawing file for a small cottage started to show hiding artifacts in most planes similar to when two items are drawn in the same place.  ie, small triangles along the edges, and blotches of colour throughout the planes.  however, only one entity was in each place. 

I tried auditing the drawing, purging, rebooting, but nothing would fix this artifact issue.  xreffed drawings in this file would have the problem inside the file (ie as an xref), but the original drawings did not.  if I switched to parallel view, the problem went away.

as a fix, I copied everything to a new drawing, renamed the old one to a dead file, and renamed the new drawing to the original.  this new file does not have the problem!  is there some better, easier, faster, method to avoid this issue?  and/or, did the drawing somehow get a setting that is not readily apparent and that could be easily reset?  as a background issue, ACA died the last time I was in it, when I went out to Sketchup 8 and imported a dwg file.  ACA died after about 5 minutes of sitting on its own.  so, the file could maybe possibly have been silently corrupted by ACA when it croaked.  any feedback would be great, as I don't really enjoy these one hour detours that ACA dreams up.

[MichaelBussiere2]

Thank you for your post.  In this case I have tested the supplied file and do not see a problem within my test environment on a few test machines.  I am leaning towards now an issue with the system itself.  Please use the link below to generate a working system information file (NFO) for further review.  This will help us offer further suggestions on your inquiry moving forward.  Thank you and we look forward to your reply update and file to aide in moving forward.

NFO Creation Link: http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=7491145&linkID=9240617