The company I work for purchased some new computers and they installed Civil 3D 2015 on these machines since that is what the rest of the office is currently using. The user with the new computers are complaining that the Civil 3D 2015 is just "disappearing". It seems to be closing without warning and doesn't even notify you that it has error-ed. There doesn't seem to be a specific problem or command causing it. The person who was in charge of setting up these computers did say there was a graphics card compatibility issue. I am wondering if this could be caused by the graphics card or Windows 10? Although, our other machines that have Windows 10 aren't having this problem. Any ideas or suggestions would be welcome.