other stations running 2006LT accessing the NAS have no such problem...
AutoCAD is renaming the DWG to atmpxxxx. This seems to be occurring when the BAK file is locked - you can simulate it by changing the properties of the BAK file to read-only and then trying to save the DWG. This simulation works on local files too.
I have submitted a support ticket and, as per usual, AutoDesk have no solution. I will post here if they ever come up with something.
Or file saves, seems normal then all changes disappear.
Sometimes I can add some drawing to a file, click the "SAVE" icon and AutoCad locks up. If I wait long enough rather than switch off, AutoCAD allows me to delete the file where I see an underlying message: "This program is not responding".
I have uninstalled and reinstalled twice and the problem remains. Once I uninstalled I lost the backup files. I'm now utilizing my laptop until I can get this resolved
After the files are missing, the temporary files will appear in the missing folder.
Temporary file names will be something like" atmp9454" , or "savE5F5.tmp"
Just choose one of the files above, and change the file extention to ".dwg" (i.e.: atmp9454.dwg)
Then you will recover your missing file.
It worked for me, I hope it will work for you too!
I also am working with AuotCAD 2012 and getting a HUGE amount of ATMP files. Today I came in and my .DWG was totally missing and I had to look at the timestamp of the ATMP to determine which was my latest.
AUTODESK THIS HAS BEEN A BUG FOR YEARS!!!! FIX YOUR CODE ASAP!
Your moto shouldn't be "IF IT'S BROKE, DON'T FIX IT." leave that one to Microsoft.