I don't have a solution (sorry). But I am having the same problem on my installation and one other installation in the office.
Interestingly though, it is only happeing with our two 32-bit installations. The other guy in the office with AutoCAD is running 64-bit and says that it has yet to happen to him...
(All three installations are Civil 3D 2012)
**UPDATE 9-16-11: It has begun happening on the 64-bit installation as well now.
I was in the habit of purging and auditing a file before closing it. Recently I have found that if I don't purge after editing some text and then close the file Civil3d crashed. Also I have found the problem in dimensions (if I override the text) and multi-leaders.
It would be nice to hear from Autodesk seeing as there is a similar thread from 2008.
Even if its not a solution some work-a-round would be good. Like setting audit to run in the background before or after autosave.
I think it is obvious now that Autodesk isn't doing anything about this. It's been a problem since the day I downloaded 2012.
You should check before you speak...SP1 was released yesterday which fixes this.
I'm still on civil3d2009 and ironically only having issued with "dragged labels" in one particular drawing. I think it was corrupted on another work station. I've audited and purged a 100 times. Changed the DTEXTED to 1 as noted, ran audit and saved... dragged the first label to new position, no problem, dragged the second and ... same thing -freezing up. Have to resort to ctrl alt delete to close program and even then, it takes forever. Is there a fix for this in 2009?
Sorry to read that you are still having problems. The group I worked with had to scrap our template drawing and start a new template in 2009 format. We had used a 2002 drawing before that and just saved it in 2009 format. As it turned out, that wasnt the best strategy. I dont know if the service packs for 2009 ever fixed the underlying issue because we moved to C3D 2010 & then C3D 2012. We have been using a 64bit load of Windows 7 with Civil 3d 2012 and it has been rock solid. The key for us was creating a new template in the version we were working in and then just insert our blocks & styles as needed.
Wish I had better news for you!