I did a small boundary in C3d 2012 after installation as a test and had a line of text in it I needed to edit..couldn't. Tried to erase it. Couldn't. Hit the undo button until I got rid of it. Retyped it. Just for kicks, tried to erase it. Couldn't. Ended drawing, opened it back up, could change it or erase it. Once. Then couldn't erase it or change it. Ran audit. No errors, but after it ran, could edit it or change it. Once. Then couldn't. Sticking with 2011.
I have noticed more problems when Carbonite - my backup starts up when I am drawing. I set it to not turn on during the day, but it won't behave. But these problems happen in nearly all my drawings. Suddenly I lose my cursor in the drawing window or I cannot edit text. I have tried reinstalling, still the same thing happens. I have the proper certified video card. I am running Windows 7 on a Windows i7 Quad core with 9 GB RAM. I sent dwgs to the support staff and they said yes it happens, but they didn't give me any real advice except to audit.
I don't mind a computer bug here and there but on the COPY or EDIT Command?? A MISSING CURSOR? It doesn't inspire confidence when you need to build a road corridor.
With the pipes, I started the drawing in Civil 3D 2011. It won't let me change the rim elevation on just some manholes. Others, it works fine. Most it won't let me change the pipe material. I go to pipe properties, I fill in the material , then when I hit enter, it goes back to being blank. I cannot for the life of me change the pipe material. At all. I have to totally create a new pipe and pray I get it totally right the first time, cause I won't be able to change it.