AutoCAD Civil 3D

[#1]

Anyone have any info on why I'd get this error when doing an Export to AutoCAD 2010/2007/2004...?  It seems to be innocuous, and irrelevant, but it's disturbing none-the-less.  I haven't been able to identify any reason why it appears, and all drawings seem to work normally, with no problems.  AUDITs turn up no errors.  So I've just been ignoring this message, but it's distracting.  And it doesn't always appear...  although I haven't been able yet to identify what causes it to appear in some drawings, and not others.  I think it only ever happens when there's an XREF, but not sure...  (Maybe when an XREF is in an older version of C3D/LDD/AutoCAD...?)

[#2]

Don't know why this error occurs but I get it very regularly in 2012 - seems to occur after QSAVE (when it automatically does a save)

I have had similar messages in the past when XREFS are involved so I bound them first and all seemed ok, then didn't save the original dwg

[#3]

I can't obviously reply your trouble, but it sounds like a LAN or UAC problem.

Be sure that you have admin privileges on that computer, then unplug Ethernet cable and try again.

[#4]

I've also concluded it is more annoying than a real problem. I see this often after creating a pipe network from a polyline, although I know it's happened after performing other tasks. To be on the safe side I will usually close the drawing and reopen right away. 

[#5]

We get this this message regularly in 2012. Most people ignore it but I always close the drawing and run a recover. Half the time it finds an error or two other times it finds no errors.

[#6]

A regular occurance in 2012 for me too. Again rarely appears to relate to anything specific.