I upgraded from Civil3D 2012 to 2014 last week. Have a dwg that I worked on right up until the upgrade that will not even attempt to open in 2014. I go to the "file open" dialogue box, select open, screen goes to gray as if no files are active. No errors, warnings, nothing. Tried running recovery, sotware crashes every time. I have an older recovered vesion of the file from when the 2012 software crashed about a month ago (typical crash, nothing unsual) that will open fine.
Any thoughts? Thanks!