I am constructing a parking lot using feature lines. I have created a feature line for my toe of curb and from that feature line I have used the grading tool to create the face of curb, top of curb and the fill/cut slope behind the curb. This leads me to my trouble. I created fill/cut slopes at 2:1s but would like to change them to 4:1s. I have successfully completed this for 3 of my 4 parts of the parking lot. However when I try to edit the 4th side I get an error message and then the program shuts down. Has anyone ran into this problem before? Solutions maybe? Thanks.