I have made some changes to the CUII (http://forums.autodesk.com/t5/AutoCAD-Civil-3D/Geo
Hitting <Enter> bring the command line back to the "Type a command" prompt - ay ideas why this is happening now and how to solve it....
Mine actually did this in 2013. It's not doing it on my 2014. I found that you can actually start typing the command and it will reckognize it from what you are showing in the screenshot.